100000 - Document - Document and Entity Information link:presentationLink link:calculationLink link:definitionLink 100010 - Statement - CONSOLIDATED BALANCE SHEETS link:presentationLink link:calculationLink link:definitionLink 100020 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 100030 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS link:presentationLink link:calculationLink link:definitionLink 100040 - Statement - STATEMENTS OF SHAREHOLDERS' EQUITY link:presentationLink link:calculationLink link:definitionLink 100050 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS link:presentationLink link:calculationLink link:definitionLink 100060 - Disclosure - DESCRIPTION OF BUSINESS link:presentationLink link:calculationLink link:definitionLink 100070 - Disclosure - IMPACT OF COVID- 19 link:presentationLink link:calculationLink link:definitionLink 100080 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES link:presentationLink link:calculationLink link:definitionLink 100090 - Disclosure - REVENUE link:presentationLink link:calculationLink link:definitionLink 100100 - Disclosure - ACCOUNTS RECEIVABLE link:presentationLink link:calculationLink link:definitionLink 100110 - Disclosure - INVENTORIES link:presentationLink link:calculationLink link:definitionLink 100120 - Disclosure - PREPAID EXPENSES AND OTHER CURRENT ASSETS link:presentationLink link:calculationLink link:definitionLink 100130 - Disclosure - PROPERTY AND EQUIPMENT, NET link:presentationLink link:calculationLink link:definitionLink 100140 - Disclosure - LEASES link:presentationLink link:calculationLink link:definitionLink 100150 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS link:presentationLink link:calculationLink link:definitionLink 100160 - Disclosure - ACCRUED EXPENSES AND OTHER link:presentationLink link:calculationLink link:definitionLink 100170 - Disclosure - NET INCOME (LOSS) PER COMMON SHARE link:presentationLink link:calculationLink link:definitionLink 100180 - Disclosure - LONG-TERM DEBT link:presentationLink link:calculationLink link:definitionLink 100190 - Disclosure - INCOME TAXES link:presentationLink link:calculationLink link:definitionLink 100200 - Disclosure - COMMITMENTS AND CONTINGENCIES link:presentationLink link:calculationLink link:definitionLink 100210 - Disclosure - SHAREHOLDERS' EQUITY link:presentationLink link:calculationLink link:definitionLink 100220 - Disclosure - STOCK OPTIONS AND RESTRICTED SHARES link:presentationLink link:calculationLink link:definitionLink 100230 - Disclosure - SEGMENT DATA link:presentationLink link:calculationLink link:definitionLink 100240 - Disclosure - RESTRUCTURING EXPENSE link:presentationLink link:calculationLink link:definitionLink 100250 - Disclosure - ACQUISITION link:presentationLink link:calculationLink link:definitionLink 100260 - Disclosure - SUBSEQUENT EVENTS link:presentationLink link:calculationLink link:definitionLink 100270 - Disclosure - QUARTERLY FINANCIAL DATA (UNAUDITED) link:presentationLink link:calculationLink link:definitionLink 100280 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies) link:presentationLink link:calculationLink link:definitionLink 100290 - Disclosure - REVENUE (Tables) link:presentationLink link:calculationLink link:definitionLink 100300 - Disclosure - ACCOUNTS RECEIVABLE (Tables) link:presentationLink link:calculationLink link:definitionLink 100310 - Disclosure - INVENTORIES (Tables) link:presentationLink link:calculationLink link:definitionLink 100320 - Disclosure - PREPAID EXPENSES AND OTHER CURRENT ASSETS (Tables) link:presentationLink link:calculationLink link:definitionLink 100330 - Disclosure - PROPERTY AND EQUIPMENT, NET (Tables) link:presentationLink link:calculationLink link:definitionLink 100340 - Disclosure - LEASES (Tables) link:presentationLink link:calculationLink link:definitionLink 100350 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS (Tables) link:presentationLink link:calculationLink link:definitionLink 100360 - Disclosure - ACCRUED EXPENSES AND OTHER (Tables) link:presentationLink link:calculationLink link:definitionLink 100370 - Disclosure - NET INCOME (LOSS) PER COMMON SHARE (Tables) link:presentationLink link:calculationLink link:definitionLink 100380 - Disclosure - LONG-TERM DEBT (Tables) link:presentationLink link:calculationLink link:definitionLink 100390 - Disclosure - INCOME TAXES (Tables) link:presentationLink link:calculationLink link:definitionLink 100400 - Disclosure - SHAREHOLDERS' EQUITY (Tables) link:presentationLink link:calculationLink link:definitionLink 100410 - Disclosure - STOCK OPTIONS AND RESTRICTED SHARES (Tables) link:presentationLink link:calculationLink link:definitionLink 100420 - Disclosure - SEGMENT DATA (Tables) link:presentationLink link:calculationLink link:definitionLink 100430 - Disclosure - RESTRUCTURING EXPENSE (Tables) link:presentationLink link:calculationLink link:definitionLink 100440 - Disclosure - ACQUISITION (Tables) link:presentationLink link:calculationLink link:definitionLink 100450 - Disclosure - QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables) link:presentationLink link:calculationLink link:definitionLink 100460 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 100470 - Disclosure - REVENUE - Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 100480 - Disclosure - REVENUE - Disaggregation of Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 100490 - Disclosure - REVENUE - Summary of Contract Assets and Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 100500 - Disclosure - ACCOUNTS RECEIVABLE (Accounts Receivable and Allowance for Doubtful Accounts) (Details) link:presentationLink link:calculationLink link:definitionLink 100510 - Disclosure - INVENTORIES (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 100520 - Disclosure - INVENTORIES (Details) link:presentationLink link:calculationLink link:definitionLink 100530 - Disclosure - PREPAID EXPENSES AND OTHER CURRENT ASSETS (Summary of Prepaid Expenses and Other Current Assets) (Details) link:presentationLink link:calculationLink link:definitionLink 100540 - Disclosure - PREPAID EXPENSES AND OTHER CURRENT ASSETS (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 100550 - Disclosure - PROPERTY AND EQUIPMENT (Summary of Property and Equipment) (Details) link:presentationLink link:calculationLink link:definitionLink 100560 - Disclosure - PROPERTY AND EQUIPMENT (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 100570 - Disclosure - PROPERTY AND EQUIPMENT (Useful Lives) (Details) link:presentationLink link:calculationLink link:definitionLink 100580 - Disclosure - LEASES (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 100590 - Disclosure - LEASES (Summary of Assets Leased from Third Parties) (Details) link:presentationLink link:calculationLink link:definitionLink 100600 - Disclosure - LEASES (Summary of Estimated Maturity of Lease Liabilities) (Details) link:presentationLink link:calculationLink link:definitionLink 100610 - Disclosure - LEASES (Schedule of Revenue and Cost of Sales Arising from Sales-Type Leases) (Details) link:presentationLink link:calculationLink link:definitionLink 100620 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 100630 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS (Useful Lives) (Details) link:presentationLink link:calculationLink link:definitionLink 100640 - Disclosure - LEASES (Summary of Estimated Maturity of Lease Liabilities) (Details) 2 link:presentationLink link:calculationLink link:definitionLink 100650 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS (Summary of Components and Changes in Other Intangible Assets) (Details) link:presentationLink link:calculationLink link:definitionLink 100660 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS (Summary of Estimated Amortization Expense) (Details) link:presentationLink link:calculationLink link:definitionLink 100670 - Disclosure - GOODWILL AND OTHER INTANGIBLE ASSETS (Summary of Amortization Expense) (Details) link:presentationLink link:calculationLink link:definitionLink 100680 - Disclosure - ACCRUED EXPENSES AND OTHER (Accrued Expenses and Other) (Details) link:presentationLink link:calculationLink link:definitionLink 100690 - Disclosure - ACCRUED EXPENSES AND OTHER (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 100700 - Disclosure - ACCRUED EXPENSES AND OTHER (Warranty Accrual) (Details) link:presentationLink link:calculationLink link:definitionLink 100710 - Disclosure - NET INCOME (LOSS) PER COMMON SHARE (Earnings per Share) (Details) link:presentationLink link:calculationLink link:definitionLink 100720 - Disclosure - NET INCOME (LOSS) PER COMMON SHARE (Potentially Dilutive Securities Excluded From the Calculation of Diluted Net Income (Loss) Per Common Share ) (Details) link:presentationLink link:calculationLink link:definitionLink 100730 - Disclosure - LONG-TERM DEBT (Summary of Long-Term Debt) (Details) link:presentationLink link:calculationLink link:definitionLink 100740 - Disclosure - LONG-TERM DEBT (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 100750 - Disclosure - LONG-TERM DEBT (Aggregate Maturities) (Details) link:presentationLink link:calculationLink link:definitionLink 100760 - Disclosure - INCOME TAXES (Schedule of Components of Income Tax Expense or Benefit) (Details) link:presentationLink link:calculationLink link:definitionLink 100770 - Disclosure - INCOME TAXES (Reconciliation of Tax Rates) (Details) link:presentationLink link:calculationLink link:definitionLink 100780 - Disclosure - INCOME TAXES (Schedule of Deferred Tax Assets) (Details) link:presentationLink link:calculationLink link:definitionLink 100790 - Disclosure - INCOME TAXES (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 100800 - Disclosure - INCOME TAXES (Schedule of Components of Income Tax Expense or Benefit) (Details) 2 link:presentationLink link:calculationLink link:definitionLink 100810 - Disclosure - INCOME TAXES (Unrecognized Tax Benefit Activity) (Details) link:presentationLink link:calculationLink link:definitionLink 100820 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details) link:presentationLink link:calculationLink link:definitionLink 100830 - Disclosure - SHAREHOLDERS' EQUITY (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 100840 - Disclosure - SHAREHOLDERS' EQUITY (Schedule of ESPP Activity) (Details) link:presentationLink link:calculationLink link:definitionLink 100850 - Disclosure - STOCK OPTIONS AND RESTRICTED SHARES (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 100860 - Disclosure - STOCK OPTIONS AND RESTRICTED SHARES (Stock-based Compensation) (Details) link:presentationLink link:calculationLink link:definitionLink 100870 - Disclosure - STOCK OPTIONS AND RESTRICTED SHARES (Summary of Outstanding Stock Options) (Details) link:presentationLink link:calculationLink link:definitionLink 100880 - Disclosure - STOCK OPTIONS AND RESTRICTED SHARES (Summary of Exercise Price Range) (Details) link:presentationLink link:calculationLink link:definitionLink 100890 - Disclosure - STOCK OPTIONS AND RESTRICTED SHARES (Schedule of Performance-Vesting Restricted Stock and Time Vesting-Restricted Stock) (Details) link:presentationLink link:calculationLink link:definitionLink 100900 - Disclosure - STOCK OPTIONS AND RESTRICTED SHARES (Summary of Unrecognized Compensation Cost) (Details) link:presentationLink link:calculationLink link:definitionLink 100910 - Disclosure - SEGMENT DATA (Reconciliation of Segment Operations) (Details) link:presentationLink link:calculationLink link:definitionLink 100920 - Disclosure - SEGMENT DATA (Reconciliation of Segment Assets and Liabilities) (Details) link:presentationLink link:calculationLink link:definitionLink 100930 - Disclosure - SEGMENT DATA (Additional Information) (Details) link:presentationLink link:calculationLink link:definitionLink 100940 - Disclosure - RESTRUCTURING EXPENSE (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 100950 - Disclosure - RESTRUCTURING EXPENSE (Restructuring by Statement of Operations Location) (Details) link:presentationLink link:calculationLink link:definitionLink 100960 - Disclosure - RESTRUCTURING EXPENSE (Restructuring by Segment) (Details) link:presentationLink link:calculationLink link:definitionLink 100970 - Disclosure - ACQUISITION (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 100980 - Disclosure - ACQUISITION - Schedule of Preliminary Allocation of Purchase Consideration to Fair Value of Assets Acquired and Liabilities Assumed (Details) link:presentationLink link:calculationLink link:definitionLink 100990 - Disclosure - ACQUISITION - Schedule of Intangible Assets Acquired at Date of Acquisition (Details) link:presentationLink link:calculationLink link:definitionLink 101000 - Disclosure - QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) link:presentationLink link:calculationLink link:definitionLink 101010 - Disclosure - QUARTERLY FINANCIAL DATA (UNAUDITED) (Parenthetical) (Details) link:presentationLink link:calculationLink link:definitionLink