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Consolidated Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cash flows from operating activities:    
Net loss $ (111,186,000) $ (40,110,000)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation and amortization 27,946,000 18,426,000
Fair value adjustment on derivative instrument 597,000 0
Provision for bad debts, net of recoveries 512,000 715,000
Impairment of capitalized software 1,410,000 0
Provision for excess and obsolete inventory 538,000 980,000
Share-based compensation expense 10,419,000 7,302,000
Amortization of debt discount and debt issuance costs 4,016,000 9,772,000
Loss on debt conversion and extinguishment, net 76,354,000 0
Deferred income taxes 659,000 (598,000)
Other 667,000 840,000
Changes in assets and liabilities:    
Accounts receivable (10,797,000) 377,000
Inventories (13,336,000) (3,077,000)
Prepaid expenses and other assets (3,070,000) (901,000)
Accounts payable 27,087,000 (12,996,000)
Accrued expenses, income taxes, and other 8,234,000 1,271,000
Net cash provided by (used in) operating activities 20,050,000 (17,999,000)
Cash flows from investing activities:    
Purchases of property, plant and equipment (5,736,000) (6,621,000)
Proceeds from the sale of property, plant and equipment 392,000 517,000
Additions to capitalized software development costs and purchases of intangible assets (29,369,000) (22,109,000)
Net cash used in investing activities (34,713,000) (28,213,000)
Cash flows from financing activities:    
Gross proceeds received from issuance of Series E preferred stock 25,000,000 10,000,000
Gross proceeds from the issuance of 2025 Notes 100,000,000 0
Payment of issuance costs related to 2025 Notes (3,645,000) 0
Cash paid to investors in private exchange transactions (32,062,000) 0
Payoff of term loan and related extinguishment costs (48,830,000) 0
Repurchase of Series E preferred stock (2,354,000) 0
Proceeds from the exercise of warrants to purchase common stock 1,861,000 17,542,000
Net borrowing of bank and overdraft facilities (199,000) (1,047,000)
Principal payments under finance lease obligations (2,756,000) (1,022,000)
Proceeds from stock option exercises and employee stock purchase plan, net of taxes paid on vested restricted stock units 5,066,000 1,996,000
Net cash provided by financing activities 42,081,000 27,469,000
Effect of exchange rates on cash 523,000 (259,000)
Net increase (decrease) in cash, cash equivalents and restricted cash 27,941,000 (19,002,000)
Cash, cash equivalents and restricted cash, beginning of period 12,074,000 31,076,000
Cash, and cash equivalents, end of period 40,015,000 12,074,000
Supplemental disclosures of cash flow information:    
Interest 3,215,000 9,296,000
Income taxes, net of tax refunds 142,000 939,000
Supplemental disclosures of non-cash activities:    
Transfer of inventories to rental assets 4,036,000 3,748,000
Purchases of property, plant and equipment under capital lease 664,000 1,341,000
Right-of-use assets obtained in exchange for operating leases liabilities 7,931,000 4,694,000
Capital expenditures financed through accounts payable or accrued liabilities 5,710,000 2,926,000
Issuance of common stock under Settlement Agreement 972,000 1,439,000
Preferred stock issued in extinguishment of term loan accrued interest 2,330,000 0
Debt discount and issuance costs extinguished in notes conversion 1,728,000 0
2022 Notes conversion to equity 59,907,000 0
Novatel Wireless Notes conversion to equity 250,000 0
2025 Notes issued to extinguish 2022 Notes 80,375,000 0
2025 Notes conversion, including shares issued in satisfaction of interest-make-whole payment $ 14,353,000 $ 0