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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities:    
Net income (loss) $ (30,001) $ (93,002)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:    
Depreciation and amortization 13,051 9,692
Provision for bad debts, net of recoveries 266 74
Impairment of capitalized software 1,197 0
Provision for excess and obsolete inventory 496 180
Share-based compensation expense 11,405 5,981
Amortization of debt discount and debt issuance costs 746 3,245
Fair value adjustment on derivative instrument (1,823) (826)
Loss on debt conversion and extinguishment, net 432 75,174
Deferred income taxes 38 10
Other 553 158
Changes in assets and liabilities:    
Accounts receivable [1] 6,483 (21,498)
Inventories [1] (834) 2,725
Prepaid expenses and other assets [1] 1,158 (5,298)
Accounts payable [1] (16,015) 22,334
Accrued expenses, income taxes, and other [1] 818 5,713
Net cash (used in) provided by operating activities (12,030) 4,662
Cash flows from investing activities:    
Acquisition of noncontrolling interest (116) 0
Purchases of property, plant and equipment (2,455) (2,831)
Proceeds from the sale of property, plant and equipment 506 235
Additions to capitalized software development costs and purchases of intangible assets (15,369) (10,637)
Net cash used in investing activities (17,434) (13,233)
Cash flows from financing activities:    
Gross proceeds from the issuance of 2025 Notes 0 100,000
Payment of issuance costs related to 2025 Notes 0 (2,544)
Cash paid to investors in private exchange transactions 0 (32,062)
Payoff of term loan and related extinguishment costs 0 (48,830)
Gross proceeds received from issuance of Series E preferred stock 0 25,000
Repurchase of Series E preferred stock 0 (2,354)
Proceeds from the exercise of warrants to purchase common stock 0 1,861
Net borrowing of bank and overdraft facilities 295 104
Principal payments under finance lease obligations (2,173) (1,462)
Proceeds from a public offering, net of issuance costs 29,369 0
Proceeds from stock option exercises and employee stock purchase plan, net of taxes paid on vested restricted stock units 2,020 1,431
Net cash provided by financing activities 29,511 41,144
Effect of exchange rates on cash 321 (2,547)
Net increase in cash, cash equivalents and restricted cash 368 30,026
Cash, cash equivalents and restricted cash, beginning of period 40,015 12,074
Cash, and cash equivalents, and restricted cash, end of period [2] 40,383 42,100
Cash paid during the year for:    
Interest 2,782 532
Income taxes 252 9
Supplemental disclosures of non-cash activities:    
Transfer of inventories to rental assets 3,403 1,511
Capital expenditures financed through accounts payable or accrued liabilities 3,641 3,393
Right-of-use assets obtained in exchange for operating leases liabilities 148 4,229
Preferred stock issued in extinguishment of term loan accrued interest 0 2,330
Debt discount and issuance costs extinguished in notes conversion 0 1,728
2022 Notes conversion to equity 0 59,907
Novatel Wireless Notes conversion to equity 0 250
2025 Notes issued to extinguish the 2022 Notes 0 80,375
2025 Notes conversion, including shares issued in satisfaction of interest make-whole payment $ 5,383 $ 0
[1] Operating assets and liabilities balances include assets and liabilities classified as held for sale as of June 30, 2021 (see Note 4. Business Divestiture).
[2] Cash, cash equivalents and restricted cash balance includes restricted cash of $3,693, and cash and cash equivalents of $5,849 classified as held for sale as of June 30, 2021 (see Note 4. Business Divestiture).