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Development and Other Agreements - Additional Information (Detail) - Google Life Sciences LLC - Collaborative Arrangement - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Sep. 30, 2015	Jun. 30, 2018	Dec. 31, 2015	Aug. 10, 2015
Development Agreements [Line Items]
Sales Revenue, Goods, Net		$ 750.0
Commitment Amount, Royalty Eligible Sales Threshold Not Achieved				$ 0.0
Collaborative Arrangement, Milestone Payments
Development Agreements [Line Items]
Development & Regulatory Milestone Payments				65.0
Collaborative Arrangement, Initial Payment
Development Agreements [Line Items]
Upfront Fee				$ 35.0
Shares, Issued	404,591
Share Price				$ 90.29
Research and Development Expense | Collaborative Arrangement, Initial Payment
Development Agreements [Line Items]
R&D expense through issuance of common stock			$ 36.5

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