Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
Revenue	$ 4,287	$ 8,910
Cost of goods sold	9,706	14,019
Gross loss	(5,419)	(5,109)
Operating expenses:
General and administrative	1,767	2,068
Sales and marketing	391	338
Research and development	579	433
Loss from operations	(8,156)	(7,948)
Other income (expense):
Interest income	24	16
Interest expense	(35)	(23)
Realized gain (loss) on foreign currency translation	683	(357)
Total other income (expense)	672	(364)
Loss before income taxes	(7,484)	(8,312)
Income tax benefit (expense)	151	(36)
Net loss	$ (7,333)	$ (8,348)
Net loss per common share
Basic	$ (0.28)	$ (0.32)
Diluted	$ (0.28)	$ (0.32)
Weighted average common shares outstanding used in computing net loss per common share basic and diluted	26,226,614	26,129,276