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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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