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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Cumulative adjustment to accumulated deficit |  |  |  | $ 207
Deferred revenue from a license and collaboration agreement | $ 15,000 |  |  |
Reduction to research and development expenses | 0 | $ 50 |  |
Accounts receivable | $ 15,000 |  |  |
Software |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives | 3 years |  |  |
Computer equipment |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives | 3 years |  |  |
Furniture | Minimum |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives | 3 years |  |  |
Furniture | Maximum |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives | 7 years |  |  |
Leasehold improvements | Minimum |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives | 3 years |  |  |
Leasehold improvements | Maximum |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives | 7 years |  |  |
Accumulated Deficit |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Cumulative adjustment to accumulated deficit |  |  |  | $ 207
AS 2016-02 |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Lease practical expedients | true |  |  |
Impact of new lease accounting standard on assets and liabilities | $ 2,100 |  |  |
ASU 2014-09 | ISU Abxis | Difference between Revenue Guidance in Effect before and after Topic 606 | Accumulated Deficit |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Cumulative adjustment to accumulated deficit |  |  | $ 200 |

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