CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Cash flows used in operating activities:
Net loss	$ (8,152)	$ (13,703)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	2,752	3,170
Loss on extinguishment of debt, net	788
Accretion of interest on long-term payment obligation	305	399
Amortization of debt issuance costs	807	811
Stock-based compensation expense	2,480	2,842
Loss on disposal of fixed assets		331
Changes in operating assets and liabilities:
Accounts receivable	(2,786)	(1,437)
Inventories	484	3,285
Prepaid expenses and other assets	(275)	441
Accounts payable	(222)	(191)
Payment obligation liability	(1,192)	(1,185)
Deferred revenue	5	(430)
Accrued expenses and other liabilities	(2,826)	(550)
Net cash used in operating activities	(7,832)	(6,217)
Cash flows from investing activities:
Capital expenditures	(967)	(549)
Net cash used in investing activities	(967)	(549)
Cash flows from financing activities:
Proceeds from issuance of debt, net of issuance costs	53,035
Repayments of debt	(58,741)
Sale of common stock, net of issuance costs	12,560
Proceeds from issuance of Series B preferred stock	12,000
Taxes paid related to net share settlement of restricted stock units	(777)	(221)
Net cash provided by (used in) financing activities	18,077	(221)
Effect of exchange rates on cash	658	(564)
Net increase (decrease) in cash	9,936	(7,551)
Cash at beginning of period	9,116	16,667
Cash at end of period	19,052	9,116
Supplemental Disclosures of Cash Flow Information:
Interest paid	2,661	1,615
Taxes paid, net	140	167
Non-cash investing and financing activities:
Warrants issued as debt issuance costs in connection with debt agreement	2,319	569
Property and equipment included in accounts payable and accruals	66	32
Cancellation of reacquired warrants	1,282
Common Stock
Non-cash investing and financing activities:
Stock issued to settle liability	$ 255
Restricted Stock Units (RSUs)
Non-cash investing and financing activities:
Stock issued to settle liability		$ 448