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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Cash flows from operating activities:    
Net loss $ (10,779) $ (6,530)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 633 637
Provision for doubtful accounts 112 35
Provision for inventory obsolescence (83) 0
Share-based compensation 1,836 743
Loss from disposal of property and equipment 8 0
Unrealized foreign currency (gain) loss, net 892 0
Change in fair value of derivative instruments 32 1,305
Change in fair value of contingent consideration (225) 363
Amortization of debt discount 868 814
Changes in operating assets and liabilities:    
Accounts receivable (2,883) (5,136)
Inventory 1,744 698
Prepaid expenses and other current assets (826) (1,647)
Other assets (11) 5
Accounts payable (619) 932
Accrued liabilities 1,142 1,229
Other liabilities 161 621
Net cash used in operating activities (7,998) (5,931)
Cash flows from investing activities:    
Purchases of property and equipment (685) (392)
Cash used in asset acquisition (767) 0
Cost incurred for intangible assets (3) (22)
Net cash used in investing activities (1,455) (414)
Cash flows from financing activities:    
Repayments on capital leases (102) (64)
Proceeds from issuance of ordinary shares, net of issuance costs 0 1,610
Proceeds from stock option exercises 84 436
Proceeds from warrant exercises 58 0
Tax payments related to shares withheld upon vesting of restricted stock (56)  
Net cash provided by (used in) financing activities (16) 1,982
Effect of exchange rate changes on cash (35) 112
Net decrease in cash (9,504) (4,251)
Cash at beginning of period 52,639 10,864
Cash at end of period 43,135 6,613
Supplemental disclosures:    
Cash paid for interest 1,402 1,283
Cash paid for income taxes 87 0
Supplemental disclosures of non-cash investing and financing activities:    
Unpaid balance for property and equipment 705 730
Assets acquired under capital leases 69 0
Equity consideration in an asset acquisition 337 0
Inventory acquired in an asset acquisition 1,104 0
Consideration payable related to asset acquisition $ 1,257 $ 0