CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net loss	$ (2,581)	$ (11,893)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,376	1,640
Gain on extinguishment of debt	(977)
Accretion of interest on long-term payment obligation	195	207
Amortization of debt issuance costs	421	503
Stock-based compensation expense	1,252	1,382
Loss on disposal of fixed assets		326
Changes in operating assets and liabilities:
Accounts receivable	(1,182)	(991)
Inventories	(911)	1,058
Prepaid expenses and other assets	(401)	(137)
Accounts payable	2,491	1,266
Payment obligation liability	(591)	(578)
Deferred revenue	52	(283)
Accrued expenses and other liabilities	(1,829)	1,279
Net cash used in operating activities	(2,685)	(6,221)
Cash flows from investing activities:
Capital expenditures	(264)	(341)
Net cash used in investing activities	(264)	(341)
Cash flows from financing activities:
Proceeds from issuance of debt, net of issuance costs	31,430
Repayments of debt	(32,118)
Sale of common stock, net of issuance costs	12,553
Taxes paid related to net share settlement of restricted stock units	(154)	(100)
Net cash provided by (used in) financing activities	11,711	(100)
Effect of exchange rates on cash	90	(603)
Net increase (decrease) in cash	8,852	(7,265)
Cash at beginning of period	9,116	16,667
Cash at end of period	17,968	9,402
Supplemental Disclosures of Cash Flow Information
Interest paid	930	785
Taxes paid	65	101
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		128
Restricted Stock Units (RSUs)
Non-cash investing and financing activities:
Restricted stock units issued to settle liability		$ 387