Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net loss	$ (3,096)	$ (2,771)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	180	118
Stock-based compensation expense	111	413
Loss (gain) on change in fair value of liability-classified warrants	338	(796)
Gain on foreign currency transactions	(51)	(391)
Loss on extinguishment of debt	194	0
Other	4	44
Changes in operating assets and liabilities:
Accounts receivable	450	(1,151)
Inventories	751	1,060
Prepaid expenses and other assets	(244)	(161)
Accounts payable, accrued expenses and other current liabilities	(1,886)	1,753
Income taxes payable	61	5
Net cash used in operating activities	(3,188)	(1,877)
Cash flows from investing activities:
Purchases of property and equipment	0	(109)
Net cash used in investing activities	0	(109)
Cash flows from financing activities:
Net (payments) proceeds under demand line of credit	(220)	596
Payments of debt	(2,000)	0
Proceeds from exercise of warrants	0	10
Net cash (used in) provided by financing activities	(2,220)	606
Effect of exchange rates on cash	15	18
Net change in cash	(5,393)	(1,362)
Cash at beginning of period	7,839	2,958
Cash at end of period	$ 2,446	$ 1,596