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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash flows from operating activities:    
Net loss $ (18,190) $ (14,739)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation and amortization 7,208 7,319
Provision for bad debts, net of recoveries 385 314
Provision for excess and obsolete inventory, net of recoveries 336 1,076
Share-based compensation expense 4,702 1,944
Amortization of debt discount and debt issuance costs 4,886 4,886
Deferred income taxes (17) (6)
Other 680 965
Changes in assets and liabilities:    
Accounts receivable 688 (8,676)
Inventories (4,608) 3,503
Prepaid expenses and other assets (1,208) 2,881
Accounts payable (3,861) 904
Accrued expenses, income taxes, and other (1,056) 532
Net cash provided by (used in) operating activities (10,055) 903
Cash flows from investing activities:    
Purchases of property, plant and equipment (2,973) (653)
Proceeds from the sale of property, plant and equipment 454 30
Additions to capitalized software development costs and purchases of intangible assets (8,801) (1,099)
Net cash used in investing activities (11,320) (1,722)
Cash flows from financing activities:    
Proceeds from the exercise of warrant to purchase common stock 10,639 0
Net repayment of DigiCore bank and overdraft facilities (394) (208)
Principal payments under finance lease obligations (532) (360)
Principal payments on mortgage bond 0 (166)
Proceeds from stock option exercises and employee stock purchase plan, net of taxes paid on vested restricted stock units 598 559
Net cash provided by (used in) financing activities 10,311 (175)
Effect of exchange rates on cash 317 (1,368)
Net decrease in cash, cash equivalents and restricted cash (10,747) (2,362)
Cash, cash equivalents and restricted cash, beginning of period 31,076 21,259
Cash, cash equivalents and restricted cash, end of period 20,329 18,897
Cash paid during the year for:    
Interest 5,327 5,362
Income taxes 642 545
Supplemental disclosures of non-cash activities:    
Transfer of inventories to rental assets 1,636 2,176
Capital expenditures financed through accounts payable 2,026 $ 25
Right-of-use assets obtained in exchange for operating leases liabilities $ 3,554