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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Cash flows from operating activities:    
Net loss $ (8,143) $ (45,840)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 13,733 14,274
Provision for bad debts, net of recoveries 555 1,618
Provision for excess and obsolete inventory, net of recoveries 1,040 1,674
Share-based compensation expense 4,876 3,748
Amortization of debt discount and debt issuance costs 9,772 10,283
Loss on extinguishment of debt, net 0 2,035
Deferred income taxes 14 319
Non-cash gain on extinguishment of acquisition-related liabilities (17,174) 0
Unrealized foreign currency transaction loss (gain), net 402 (316)
Other 1,620 1,684
Changes in assets and liabilities:    
Accounts receivable (6,883) 5,638
Inventories (11,437) 3,020
Prepaid expenses and other assets 3,251 (3,239)
Accounts payable 9,646 (730)
Accrued expenses, income taxes, and other (3,037) (8,744)
Net cash used in operating activities (1,765) (14,576)
Cash flows from investing activities:    
Purchases of property, plant and equipment (1,338) (1,789)
Proceeds from the sale of property, plant and equipment 144 253
Purchases of intangible assets and additions to capitalized software development costs (3,040) (2,839)
Net cash used in investing activities (4,234) (4,375)
Cash flows from financing activities:    
Gross proceeds received from private placement 19,661 0
Payment of issuance costs related to private placement (500) 0
Proceeds from term loans 0 64,917
Payment of issuance costs related to term loans 0 (905)
Principal repayments of short-term debt (500) (20,000)
Repurchase of convertible senior notes 0 11,900
Net repayment of DigiCore bank and overdraft facilities (1,453) (76)
Principal payments under capital lease obligations (977) (876)
Principal payments on mortgage bond (316) (288)
Proceeds from stock option exercises and employee stock purchase plan, net of taxes paid on vested restricted stock units 1,752 (506)
Net cash provided by financing activities 17,667 30,366
Effect of exchange rates on cash, cash equivalents and restricted cash (1,851) (50)
Net increase in cash, cash equivalents and restricted cash 9,817 11,365
Cash, cash equivalents and restricted cash, beginning of period 21,259 9,894
Cash, cash equivalents and restricted cash, end of period 31,076 21,259
Cash paid during the year for:    
Interest 10,642 9,074
Income taxes 672 440
Supplemental disclosures of non-cash activities:    
Transfer of inventories to rental assets 3,973 5,943
Purchases of property, plant and equipment under capital lease 1,563 290
Capital expenditures financed through accounts payable 1,680 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