Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenue
Laboratory service revenue	$ 48,363	$ 14,835
Cost of sales	16,981	9,059
Gross margin	31,382	5,776
Operating expenses:
Research and development	8,002	10,126
General and administrative	20,070	17,824
Sales and marketing	38,801	25,711
Total operating expenses	66,873	53,661
Loss from operations	(35,491)	(47,885)
Other income (expense)
Investment income	595	466
Interest expense	(50)	(54)
Total other income	545	412
Net loss	$ (34,946)	$ (47,473)
Net loss per share-basic and diluted (in dollars per share)	$ (0.32)	$ (0.49)
Weighted average common shares outstanding-basic and diluted (in shares)	110,582	97,246