Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	1 Months Ended			3 Months Ended	6 Months Ended		12 Months Ended
	Jan. 31, 2016	Mar. 31, 2013	Feb. 28, 2013	Sep. 30, 2014	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Proceeds from sale of investment in Verinata					$ 2,330	$ 0
Verinata | Cost-method Investments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Aggregate disposal value			$ 350,000
Contingent milestone payment receivable for shareholders in cost method investment			$ 100,000
Proceeds from sale of investment in Verinata		$ 3,100
Gain on sale of cost method investment		$ 1,800		$ 300
Long-term Debt | Accounting Standards Update 2015-03
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Unamortized debt issuance expense					1,000		$ 1,000
Other Noncurrent Assets | Accounting Standards Update 2015-03
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Unamortized debt issuance expense					$ (1,000)		(1,000)
Other Assets | Verinata | Cost-method Investments
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Contingent milestone payment receivable for shareholders in cost method investment							$ 2,300
Proceeds from contingent milestone payments	$ 2,300