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Fair Value Measurements - Additional Information (Detail) - USD ($) | Jun. 30, 2018 | Dec. 31, 2017
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Other current liabilities | $ 7,000,000 |
Other long-term liabilities | 7,257,000 | $ 643,000
Transfers from level 1 to level 2 | 0 |
Transfers from level 2 to level 1 | 0 |
Merck, Sharp & Dohme Corp. |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Other current liabilities | 7,000,000 |
Merck, Sharp & Dohme Corp. | Fair Value, Inputs, Level 3 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Other long-term liabilities | $ 6,000,000 |

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