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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash flows from operating activities:    
Net loss $ (16,114) $ (11,899)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 4,079 3,598
Amortization of acquisition-related inventory step-up 0 1,829
Provision for bad debts, net of recoveries 101 (111)
Provision for excess and obsolete inventory (29) 1,311
Share-based compensation expense 1,091 1,066
Amortization of debt discount and debt issuance costs 2,348 2,112
Loss on disposal of assets, net of gain on divestiture and sale of other assets 130 51
Deferred income taxes 21 88
Unrealized foreign currency transaction loss, net (37) (1,171)
Other 291 394
Changes in assets and liabilities, net of effects from divestiture:    
Accounts receivable (8,375) 378
Inventories 397 3,649
Prepaid expenses and other assets (3,820) (922)
Accounts payable 14,319 (10,063)
Accrued expenses, income taxes, and other 2,347 1,010
Net cash used in operating activities (3,177) (6,338)
Cash flows from investing activities:    
Purchases of property, plant and equipment (917) (448)
Proceeds from the sale of property, plant and equipment 58 115
Purchases of intangible assets and additions to capitalized software development costs (855) (656)
Net cash used in investing activities (1,714) (989)
Cash flows from financing activities:    
Net repayments of DigiCore bank facilities (84) (156)
Net borrowings from revolving credit facility 2,750 3,400
Principal payments under capital lease obligations (241) (273)
Principal payments on mortgage bond (70) (54)
Taxes paid on vested restricted stock units, net of proceeds from stock option exercises (785) (9)
Net cash provided by financing activities 1,570 2,908
Effect of exchange rates on cash and cash equivalents (188) 110
Net decrease in cash and cash equivalents (3,509) (4,309)
Cash and cash equivalents, beginning of period 9,894 12,570
Cash and cash equivalents, end of period 6,385 8,261
Cash paid during the year for:    
Interest 149 154
Income taxes 20 18
Supplemental disclosures of non-cash activities:    
Transfer of inventories to rental assets 1,274 819
Issuance of common stock under amended earn-out agreement 2,638 0
Additional debt discount on convertible senior notes $ 3,600 $ 0