CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net loss	$ (12,635)	$ (20,161)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	2,492	2,203
Impairment of goodwill and long-lived assets		988
Accretion of interest on long-term payment obligation	335	398
Amortization of debt issuance costs	633	698
Stock-based compensation expense	2,245	3,700
Loss on disposal of fixed assets	329
Changes in operating assets and liabilities:
Accounts receivable	(1,166)	2,961
Inventories	2,741	(6,159)
Prepaid expenses and other assets	(182)	(599)
Accounts payable	154	(2,739)
Payment obligation liability	(925)	(856)
Deferred revenue	(370)	916
Accrued expenses and other liabilities	155	1,792
Net cash used in operating activities	(6,194)	(16,858)
Cash flows from investing activities:
Capital expenditures	(425)	(553)
Net cash used in investing activities	(425)	(553)
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	(180)	(1,915)
Net cash (used in) provided by financing activities	(180)	2,131
Effect of exchange rates on cash	(685)	149
Net decrease in cash	(7,484)	(15,131)
Cash at beginning of period	16,667	36,547
Cash at end of period	9,183	21,416
Non-cash investing and financing activities:
Warrants issued as debt issuance costs in connection with debt modification	376
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	83	$ 51
Restricted Stock Units (RSUs)
Non-cash investing and financing activities:
Restricted stock units issued to Board of Directors in lieu of cash	$ 387