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Organization and Description of Business - Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenue Recognition
Revenue recognized when cash is received	$ 17,257	$ 13,903		$ 50,007	$ 31,478
Revenue recognized on accrual basis, percentage	99.00%	75.00%		96.00%	67.00%
Revenue recognized on an accrual basis	$ 262	$ 4,700		$ 2,350	$ 15,350
Revenue recognized received in cash, percentage	1.00%	25.00%		4.00%	33.00%
Total	$ 17,519	$ 18,603		$ 52,357	$ 46,828
Revenue, percent	100.00%	100.00%		100.00%	100.00%
Accrued Income Receivable
Revenue Recognition
Total		$ 3,500	$ 1,000
Afirma Gene Expression Classifier | Maximum
Revenue Recognition
Revenue recognized on accrual basis, percentage					50.00%

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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