CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net loss	$ (677)	$ (8,923)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	630	896
Gain on extinguishment of debt	(977)
Accretion of interest on long-term payment obligation	87	105
Amortization of debt issuance costs	223	374
Stock-based compensation expense	591	937
Loss on disposal of fixed assets		326
Changes in operating assets and liabilities:
Accounts receivable	625	(501)
Inventories	(995)	(296)
Prepaid expenses and other assets	(359)	(474)
Accounts payable	1,431	(1,109)
Payment obligation liability	(291)	(286)
Deferred revenue	(159)	(144)
Accrued expenses and other liabilities	(910)	2,068
Net cash used in operating activities	(781)	(7,027)
Cash flows from investing activities:
Capital expenditures	(50)	(244)
Net cash used in investing activities	(50)	(244)
Cash flows from financing activities:
Proceeds from issuance of debt, net of issuance costs	21,484
Repayments of debt	(22,014)
Taxes paid related to net share settlement of restricted stock units	(68)
Net cash used in financing activities	(598)
Effect of exchange rates on cash	195	(441)
Net decrease in cash	(1,234)	(7,712)
Cash at beginning of period	9,116	16,667
Cash at end of period	7,882	8,955
Supplemental Disclosures of Cash Flow Information
Interest paid	415	395
Taxes paid	46	18
Non-cash investing and financing activities:
Warrants issued as debt issuance costs in connection with debt agreements	$ 2,319	232
Property and equipment included in accruals		$ 165