Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenue:
Product	$ 29,755	$ 25,893	$ 52,966	$ 47,386
Research services	341	722	630	1,592
Total revenue	30,096	26,615	53,596	48,978
Cost of revenue:
Product	24,814	22,850	43,659	41,391
Research services	173	340	313	816
Gross profit	5,109	3,425	9,624	6,771
Operating expenses:
Research and development	1,551	1,920	2,855	3,203
Sales and marketing	2,722	3,420	5,054	5,658
General and administrative	3,534	6,206	7,157	8,928
Total operating expenses	7,807	11,546	15,066	17,789
Loss from operations	(2,698)	(8,121)	(5,442)	(11,018)
Interest expense	(45)	(34,027)	(90)	(50,178)
Total interest expense	(45)	(34,027)	(90)	(50,178)
Net loss	(2,743)	(42,148)	(5,532)	(61,196)
Net loss attributable to common stockholders	$ (2,743)	$ (42,148)	$ (5,532)	$ (61,196)
Net loss attributable to common stockholders per share:
Basic	$ (0.12)	$ (13.88)	$ (0.24)	$ (40.05)
Diluted	$ (0.12)	$ (13.88)	$ (0.24)	$ (40.05)
Weighted-average common shares outstanding:
Basic and diluted	22,999,988	3,035,717	22,996,152	1,527,806