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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cash flows from operating activities:    
Net income (loss) $ (25,223) $ (16,959)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:    
Depreciation and amortization 7,243 6,230
Provision for bad debts, net of recoveries (14) 101
Provision for excess and obsolete inventory 247 (173)
Share-based compensation expense 11,199 9,098
Amortization of debt discount and debt issuance costs 1,650 374
Fair value adjustment on derivative instrument (609) (1,951)
Loss on debt conversion and extinguishment, net 450 432
Deferred income taxes 189 326
Finance Lease, Right-of-Use Asset, Amortization 342 512
Other 0 107
Changes in assets and liabilities, net of effects of divestiture:    
Accounts receivable 5,477 2,668
Inventories (355) (5,414)
Prepaid expenses and other assets 2,701 1,198
Accounts payable (10,400) (1,937)
Accrued expenses, income taxes, and other 6,819 6,898
Increase (Decrease) in Operating Lease Liability (354) (537)
Net cash (used in) provided by operating activities (638) 973
Cash flows from investing activities:    
Acquisition of noncontrolling interest 0 (116)
Purchases of property, plant and equipment (763) (1,324)
Proceeds from the sale of property, plant and equipment 0 21
Additions to capitalized software development costs (3,127) (7,977)
Net cash used in investing activities (3,890) (9,396)
Cash flows from financing activities:    
Net borrowing of bank and overdraft facilities (54) 263
Principal payments under finance lease obligations (62) 0
Proceeds from a public offering, net of issuance costs 0 29,428
Principal repayments on financed other assets (1,007) (1,237)
Proceeds from stock option exercises and employee stock purchase plan, net of taxes paid on vested restricted stock units 63 1,093
Net cash (used in) provided by financing activities (1,060) 29,547
Effect of exchange rates on cash 957 (1,589)
Net (decrease) increase in cash, cash equivalents and restricted cash (4,631) 19,535
Cash, cash equivalents and restricted cash, beginning of period 49,812 40,015
Cash, and cash equivalents, and restricted cash, end of period 45,181 59,550
Cash paid during the year for:    
Interest 0 169
Income taxes 41 29
Supplemental disclosures of non-cash activities:    
Transfer of inventories to rental assets 225 1,289
Capital expenditures financed through accounts payable or accrued liabilities 2,105 2,890
Right-of-use assets obtained in exchange for operating leases liabilities 79 148
2025 Notes conversion, including shares issued in satisfaction of interest make-whole payment $ 0 $ 5,383