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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Net loss $ (8,060) $ (16,114)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 3,887 4,079
Provision for bad debts, net of recoveries 232 101
Loss on impairment of abandoned product line 576 0
Provision for excess and obsolete inventory, net of recoveries 820 (29)
Share-based compensation expense 1,142 1,091
Amortization of debt discount and debt issuance costs 2,443 2,348
Loss on disposal of assets 118 130
Deferred income taxes (4) 21
Unrealized foreign currency transaction loss (gain), net (324) 37
Other 382 291
Changes in assets and liabilities:    
Accounts receivable (3,141) (8,375)
Inventories 2,798 397
Prepaid expenses and other assets 3,555 (3,820)
Accounts payable (9,093) 14,319
Accrued expenses, income taxes, and other 289 2,347
Net cash used in operating activities (4,380) (3,177)
Cash flows from investing activities:    
Purchases of property, plant and equipment (326) (917)
Proceeds from the sale of property, plant and equipment 25 58
Purchases of intangible assets and additions to capitalized software development costs (555) (855)
Net cash used in investing activities (856) (1,714)
Cash flows from financing activities:    
Net repayment of DigiCore bank and overdraft facilities (218) (84)
Net borrowings from revolving credit facility 0 2,750
Principal payments under capital lease obligations (209) (241)
Principal payments on mortgage bond (85) (70)
Proceeds from stock option exercises, net of taxes paid on vested restricted stock units 382 (785)
Net cash provided by (used in) financing activities (130) 1,570
Effect of exchange rates on cash, cash equivalents and restricted cash 280 (188)
Net decrease in cash, cash equivalents and restricted cash (5,086) (3,509)
Cash, cash equivalents and restricted cash, beginning of period 21,259 9,894
Cash, cash equivalents and restricted cash, end of period 16,173 6,385
Cash paid during the year for:    
Interest 1,212 149
Income taxes 243 20
Supplemental disclosures of non-cash activities:    
Transfer of inventories to rental assets 1,142 1,274
Issuance of common stock under amended earn-out agreement 0 2,638
Additional debt discount on exchange of convertible senior notes $ 0 $ 3,600