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Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) segment | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) | Jan. 01, 2020 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Number of operating segments | segment |  |  | 1 |  |  |
Impairment of long lived assets | $ 0 | $ 0 | $ 0 | $ 0 |  |
Operating lease right-of-use assets | 43,137,000 |  | 43,137,000 |  |  | $ 38,005,000
Operating lease liabilities | 59,166,000 |  | 59,166,000 |  |  | $ 53,800,000
Accounting Standards Update 2018-15 |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Capitalized costs due to adoption of standard | 1,300,000 |  | 2,700,000 |  |  |
Fair Value, Inputs, Level 1 | Money market funds |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |
Fair value of money market instruments | $ 324,700,000 |  | 324,700,000 |  | $ 398,500,000 |
Unrealized gains (losses) on money market instruments |  |  | $ 0 |  | $ 0 |

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