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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Cash flows from operating activities      
Net loss $ (29,663) $ (37,144)  
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:      
Depreciation expense 4,953 7,355  
Amortization of intangible assets 6,357 6,838  
Impairments of intangible assets, property and equipment 0 17,320  
Impairments of operating lease assets 0 9,483  
Inventory write down 1,410 11,567  
Stock-based compensation expense 1,896 3,223  
Loss (gain) on extinguishment of debt 933 (7,459)  
Deferred loan costs written off 0 1,829  
Deferred income taxes 265 1,152  
Noncash losses (gains) and other, net 2,065 (734)  
Changes in operating assets and liabilities      
Accounts receivable—trade (8,999) 6,773  
Inventories 13,726 6,704  
Prepaid expenses and other assets (2,458) (11,002)  
Cost and estimated profit in excess of billings (281) 1,374  
Accounts payable, deferred revenue and other accrued liabilities 7,692 (14,955)  
Billings in excess of costs and estimated profits earned 766 (757)  
Net cash provided by (used in) operating activities (1,338) 1,567  
Cash flows from investing activities      
Capital expenditures for property and equipment (389) (958)  
Proceeds from sale of property and equipment 1,499 37  
Net cash provided by (used in) investing activities 1,110 (921)  
Cash flows from financing activities      
Borrowings on revolving Credit Facility 0 55,000  
Repayments on revolving Credit Facility (13,126) 0  
Cash paid to repurchase 2025 Notes and 2021 Notes (13,711) (3,362)  
Payment of capital lease obligations (482) (101)  
Repurchases of stock (139) (179)  
Deferred financing costs 0 (254)  
Net cash provided by (used in) financing activities (27,458) 51,104  
Effect of exchange rate changes on cash (121) (712)  
Net increase (decrease) in cash, cash equivalents and restricted cash (27,807) 51,038  
Cash, cash equivalents and restricted cash at beginning of period 128,617 57,911 $ 57,911
Cash, cash equivalents and restricted cash at end of period 100,810 108,949 $ 128,617
Noncash activities      
Operating lease right of use assets obtained in exchange for lease obligations 284 688  
Finance lease right of use assets obtained in exchange for lease obligations $ 47 $ 931