Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenue
Laboratory service revenue	$ 21,185	$ 8,119	$ 36,020	$ 12,385
Cost of sales	10,097	5,094	19,156	9,306
Gross margin	11,088	3,025	16,864	3,079
Operating expenses:
Research and development	8,640	8,115	18,766	14,686
General and administrative	17,284	13,683	35,108	26,654
Sales and marketing	30,301	20,593	56,012	37,117
Total operating expenses	56,225	42,391	109,886	78,457
Loss from operations	(45,137)	(39,366)	(93,022)	(75,378)
Other income (expense)
Investment income	425	193	891	415
Interest income (expense)	(53)	107	(107)	96
Total other income	372	300	784	511
Net loss	$ (44,765)	$ (39,066)	$ (92,238)	$ (74,867)
Net loss per share-basic and diluted (in dollars per share)	$ (0.46)	$ (0.44)	$ (0.95)	$ (0.84)
Weighted average common shares outstanding-basic and diluted (in shares)	97,902	88,919	97,578	88,791