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Development and Other Agreements - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Nov. 20, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 28, 2018
Development Agreements [Line Items] |  |  |  |  |
Collaborative research and development fee |  | $ 217.7 | $ 0.0 | $ 0.0 |
Collaborative Arrangement | Verily Life Sciences | Collaborative Arrangement, Initial Payment |  |  |  |  |
Development Agreements [Line Items] |  |  |  |  |
Initial payment on collaborative agreement | $ 250.0 |  |  |  |
Issuance of common stock in connection with acquisition, shares | 1,840,943 |  |  |  |
Collaborative research and development fee |  | $ 217.7 |  |  |
Closing stock price per share |  |  |  |  | $ 118.28
Collaborative Arrangement | Verily Life Sciences | Collaborative Arrangement, Milestone Payments |  |  |  |  |
Development Agreements [Line Items] |  |  |  |  |
Issuance of common stock in connection with acquisition, shares | 2,025,036 |  |  |  |
Additional milestones and incentive payments | $ 280.0 |  |  |  |
Milestone payments due upon achievement of future development | $ 275.0 |  |  |  |
Consecutive days used to calculate volume weighted average trading price |  | 15 days |  |  |

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- Definition Collaborative Arrangement, Development & Regulatory Milestones + References No definition available. + Details
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