CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating activities:
Net loss	$ (7,659)	$ (9,778)
Adjustments to reconcile net loss to net cash used for operating activities:
Depreciation and amortization	427	409
Stock compensation expense	1,342	502
Change in fair value of warrants	2,907	(107)
Inventory provision	(94)	93
Loss on sales of fixed assets	22	0
Foreign currency translation loss	44	1
Deferred rent	(106)	102
Changes in operating assets and liabilities:
Inventory	(18)	(563)
Accounts receivable	5,108	4,966
Other current assets	223	146
Accounts payable	(229)	(300)
Accrued expenses	(1,566)	1,507
Other assets and liabilities, net	4	(100)
Net cash provided by (used for) operating activities	405	(3,122)
Investing activities:
Expenditures for property, plant and equipment	(184)	(70)
Net cash used in investing activities	(184)	(70)
Financing activities:
Net proceeds from issuance of common stock	985	71
Deferred financing costs	8	0
Proceeds from exercise of warrants	1,727	0
Repayments of short-term debt	10	0
Other	0	(10)
Net cash provided by financing activities	2,694	61
Net increase (decrease) in cash	2,915	(3,131)
Cash at beginning of period	26,862	22,978
Cash at end of period	$ 29,777	$ 19,847