Investments in Joint Ventures - OvaXon - Additional Information (Details) $ in Thousands	1 Months Ended	41 Months Ended
	Jan. 31, 2014 USD ($)	Jun. 30, 2017 USD ($) board_seat	Dec. 31, 2016 USD ($)
Schedule of Equity Method Investments [Line Items]
Investment		$ 21,904	$ 23,655
OvaXon, LLC
Schedule of Equity Method Investments [Line Items]
Capital contributions	$ 1,500	$ 3,250
Membership interest	50.00%
Total number of seats on the joint venture's governing board | board_seat		4
Total number of seats on the joint venture's governing board, internally selected | board_seat		2
Total number of seats on the joint venture's governing board, externally selected | board_seat		2,000
OvaXon, LLC | Other Accrued Liabilities
Schedule of Equity Method Investments [Line Items]
Investment		$ (811)
OvaXon, LLC | Investments In Affiliates
Schedule of Equity Method Investments [Line Items]
Investment			$ 65
Investors | OvaXon, LLC
Schedule of Equity Method Investments [Line Items]
Capital contributions	$ 1,500	$ 3,250
Membership interest	50.00%