Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenue
Laboratory service revenue	$ 14,835	$ 4,266
Cost of sales	9,059	4,212
Gross margin	5,776	54
Operating expenses:
Research and development	10,126	6,571
General and administrative	17,824	12,971
Sales and marketing	25,711	16,524
Total operating expenses	53,661	36,066
Loss from operations	(47,885)	(36,012)
Other income (expense)
Investment income	466	222
Interest expense	(54)	(11)
Total other income	412	211
Net loss	$ (47,473)	$ (35,801)
Net loss per share-basic and diluted (in dollars per share)	$ (0.49)	$ (0.40)
Weighted average common shares outstanding-basic and diluted (in shares)	97,246	88,662