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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Cash flows from operating activities    
Net loss $ (82,651,000) $ (96,889,000)
Adjustments to reconcile net loss to net cash provided by (used in) investing activities:    
Impairments of intangible assets, property and equipment 0 20,394,000
Impairments of operating lease assets 0 15,370,000
Depreciation expense 17,064,000 24,484,000
Amortization of intangible assets 25,112,000 26,516,000
Stock-based compensation expense 7,594,000 9,784,000
Inventory write downs 8,096,000 100,794,000
Provision for doubtful accounts 2,424,000 1,127,000
Deferred income taxes 2,791,000 (149,000)
Gain on disposition of business 0 (88,375,000)
Loss (gain) on extinguishment of debt 5,290,000 (72,478,000)
Deferred loan costs written off 0 2,262,000
Other 5,210,000 3,703,000
Changes in operating assets and liabilities    
Accounts receivable—trade (44,959,000) 65,541,000
Inventories 1,935,000 51,621,000
Prepaid expenses and other current assets (8,078,000) 17,794,000
Cost and estimated profits in excess of billings 84,000 (4,317,000)
Accounts payable, deferred revenue and other accrued liabilities 36,327,000 (69,399,000)
Billings in excess of costs and estimated profits earned 7,986,000 (3,900,000)
Net cash provided by (used in) operating activities (15,775,000) 3,883,000
Cash flows from investing activities    
Capital expenditures for property and equipment (2,399,000) (2,246,000)
Proceeds from the sale of property and equipment 7,007,000 5,292,000
Proceeds from settlement of note receivable 10,784,000 0
Acquisition of businesses, net of cash acquired (3,411,000) 0
Proceeds from the sale of business (1,283,000) 105,204,000
Net cash provided by investing activities 10,698,000 108,250,000
Cash flows from financing activities    
Borrowings on revolving Credit Facility 0 182,322,000
Repayments on revolving Credit Facility (13,126,000) (169,196,000)
Cash paid to repurchase 2025 Notes and 2021 Notes (58,596,000) (40,270,000)
Bond exchange early participation payment 0 (3,500,000)
Repurchases of stock (1,414,000) (195,000)
Payment of capital lease obligations (1,517,000) (1,179,000)
Deferred financing costs (1,590,000) (9,747,000)
Net cash used in financing activities (76,243,000) (41,765,000)
Effect of exchange rate changes on cash (439,000) 338,000
Net increase (decrease) in cash, cash equivalents and restricted cash (81,759,000) 70,706,000
Cash, cash equivalents and restricted cash at beginning of period 128,617,000 57,911,000
Cash, cash equivalents and restricted cash at end of period 46,858,000 128,617,000
Supplemental cash flow disclosures    
Cash paid for interest 27,068,000 23,763,000
Cash paid (refunded) for income taxes 2,444,000 (13,941,000)
Noncash investing and financing activities    
Operating lease right of use assets obtained in exchange for lease obligations 2,340,000 4,505,000
Finance lease right of use assets obtained in exchange for lease obligations 463,000 1,401,000
Accrued purchases of property and equipment $ 0 $ 0