Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Statement [Abstract]
Revenue	$ 7,106	$ 14,469	$ 16,016	$ 28,737
Cost of goods sold	12,261	21,743	26,280	43,505
Gross loss	(5,155)	(7,274)	(10,264)	(14,768)
Operating expenses:
General and administrative	2,188	2,197	4,256	4,585
Sales and marketing	354	332	692	799
Research and development	603	391	1,036	967
Loss (gain) on disposal of assets	22	(15)	22	(15)
Loss from operations	(8,322)	(10,179)	(16,270)	(21,104)
Other income:
Interest income	21	23	37	44
Interest expense	(24)	(24)	(47)	(47)
Realized (loss) gain on foreign currency translation	(204)	196	(561)	235
Total other (expense) income	(207)	195	(571)	232
Loss before income taxes	(8,529)	(9,984)	(16,841)	(20,872)
Income tax expense	(51)		(87)	(6)
Net loss	$ (8,580)	$ (9,984)	$ (16,928)	$ (20,878)
Net loss per common share
Basic	$ (0.33)	$ (0.39)	$ (0.65)	$ (0.82)
Diluted	$ (0.33)	$ (0.39)	$ (0.65)	$ (0.82)
Weighted average common shares outstanding used in computing net loss per common share	26,142,261	25,706,797	26,135,768	25,511,972