Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Condensed Consolidated Statements of Operations
Laboratory service revenue	$ 90,296	$ 48,363
Cost of sales	22,914	16,981
Gross margin	67,382	31,382
Operating expenses:
Research and development	14,935	8,002
General and administrative	35,567	20,070
Sales and marketing	53,408	38,801
Total operating expenses	103,910	66,873
Loss from operations	(36,528)	(35,491)
Other income (expense)
Investment income	3,673	595
Interest expense	(6,510)	(50)
Total other income (expense)	(2,837)	545
Net loss before tax	(39,365)	(34,946)
Income tax expense	(59)
Net loss	$ (39,424)	$ (34,946)
Net loss per share-basic and diluted (in dollars per share)	$ (0.33)	$ (0.32)
Weighted average common shares outstanding-basic and diluted (in shares)	121,016	110,582