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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash flows from operating activities:    
Net loss $ (3,902) $ (41,946)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 10,564 11,098
Provision for bad debts, net of recoveries 536 986
Loss on impairment of abandoned product line, net of recoveries 355 1,489
Provision for excess and obsolete inventory, net of recoveries 1,219 876
Share-based compensation expense 3,678 2,942
Amortization of debt discount and debt issuance costs 7,328 7,840
Loss on extinguishment of debt, net 0 2,035
Loss on disposal of assets 455 648
Deferred income taxes (4) 9
Extinguishment of acquisition-related liabilities (17,174) 0
Unrealized foreign currency transaction loss (gain), net 319 (794)
Other 98 (309)
Changes in assets and liabilities:    
Accounts receivable (13,038) 614
Inventories 1,779 3,637
Prepaid expenses and other assets 2,423 (4,071)
Accounts payable 879 1,968
Accrued expenses, income taxes, and other 616 (1,813)
Net cash used in operating activities (3,869) (14,791)
Cash flows from investing activities:    
Purchases of property, plant and equipment (936) (1,737)
Proceeds from the sale of property, plant and equipment 109 182
Purchases of intangible assets and additions to capitalized software development costs (1,527) (2,256)
Net cash used in investing activities (2,354) (3,811)
Cash flows from financing activities:    
Gross proceeds received from private placement 19,661 0
Proceeds from term loans 0 64,917
Payment of issuance costs related to term loans 0 (905)
Principal payments on term loans (500) (20,000)
Repurchase of convertible senior notes 0 (11,900)
Net repayment of DigiCore bank and overdraft facilities (1,203) (620)
Principal payments under capital lease obligations (487) (613)
Principal payments on mortgage bond (241) (216)
Proceeds from stock option exercises and employee stock purchase plan, net of taxes paid on vested restricted stock units 1,022 (793)
Net cash provided by financing activities 18,252 29,870
Effect of exchange rates on cash, cash equivalents and restricted cash (1,680) (1,164)
Net increase in cash, cash equivalents and restricted cash 10,349 10,104
Cash, cash equivalents and restricted cash, beginning of period 21,259 9,894
Cash, cash equivalents and restricted cash, end of period 31,608 19,998
Cash paid during the year for:    
Interest 6,605 4,571
Income taxes 593 136
Supplemental disclosures of non-cash activities:    
Transfer of inventories to rental assets 3,018 4,225
Capital expenditures financed through accounts payable 2,178 0
Issuance costs financed through accounts payable 500 0
Issuance of common stock under settlement agreement 925 0
Issuance of common stock under amended earn-out agreement 0 2,638
Additional debt discount on exchange of convertible senior notes 0 3,600
Term loan debt discount issued in common stock $ 0 $ 2,340