CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net loss	$ (13,703)	$ (39,220)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	3,170	3,148
Impairment of goodwill and long-lived assets		8,771
Accretion of interest on long-term payment obligation	399	536
Amortization of debt issuance costs	811	408
Stock-based compensation expense	2,842	4,667
Loss on disposal of fixed assets	331	17
Changes in operating assets and liabilities:
Accounts receivable	(1,437)	5,450
Inventories	3,285	(5,858)
Prepaid expenses and other assets	441	196
Accounts payable	(191)	(1,890)
Payment obligation liability	(1,185)	(1,157)
Deferred revenue	(430)	1,009
Accrued expenses and other liabilities	(550)	920
Net cash used in operating activities	(6,217)	(23,003)
Cash flows from investing activities:
Capital expenditures	(549)	(341)
Net cash used in investing activities	(549)	(341)
Cash flows from financing activities:
Proceeds from issuance of debt, net of issuance costs		4,000
Proceeds from issuance of common stock under stock plans		46
Repurchase of common stock	(221)	(1,915)
Net cash (used in) provided by financing activities	(221)	2,131
Effect of exchange rates on cash	(564)	1,333
Net decrease in cash	(7,551)	(19,880)
Cash at beginning of period	16,667	36,547
Cash at end of period	9,116	16,667
Supplemental Disclosures of Cash Flow Information:
Interest paid	1,615	1,400
Taxes paid	167	104
Non-cash investing and financing activities:
Warrants issued in connection with debt	569
Common stock issued to settle earn-out obligation		3,510
Common stock issued to acquire share of noncontrolling interest		1,216
Property and equipment included in accruals	32	$ 333
Restricted Stock Units (RSUs)
Non-cash investing and financing activities:
Restricted stock units issued in settlement of accruals	$ 448