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Commitments and Contingencies - Additional Information (Details) $ in Thousands |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 15, 2018 | Jan. 31, 2020 USD ($) ft² | Dec. 31, 2019 USD ($) ft² | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jan. 01, 2019 USD ($)
Lessee Lease Description [Line Items] |  |  |  |  |  |
Operating lease, initial ROU lease assets |  |  | $ 13,754 |  |  | $ 13,700
Operating lease, initial lease liabilities |  |  | 14,168 |  |  | $ 14,500
Operating lease, weighted-average remaining lease term |  |  |  |  |  | 6 years
Operating lease, expense |  |  | 3,100 | $ 3,200 | $ 3,100 |
Operating lease, payments |  |  | $ 3,400 |  |  |
San Diego, California |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |
Area of real estate property | ft² |  |  | 52,148 |  |  |
Lease expiration date |  |  | Dec. 31, 2025 |  |  |
Lessee, operating lease, renewal term |  |  | 5 years |  |  |
Rent expense for additional office space for first twelve months |  |  | $ 900 |  |  |
Rent expense for additional office space for last twelve month |  |  | $ 1,300 |  |  |
San Diego, California | Subsequent Event |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |
Area of real estate property | ft² |  | 21,180 |  |  |  |
Lease expiration date |  | Dec. 31, 2025 |  |  |  |
Operating lease, initial ROU lease assets |  | $ 5,100 |  |  |  |
Operating lease, initial lease liabilities |  | 5,700 |  |  |  |
Unamortized lease incentive |  | $ 600 |  |  |  |
Redwood City, California |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |
Area of real estate property | ft² |  |  | 26,067 |  |  |
Lease expiration date |  |  | May 31, 2019 |  |  |
Sublease expiration date | May 31, 2019 |  |  |  |  |
Jersey City, New Jersey |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |
Area of real estate property | ft² |  |  | 1,898 |  |  |
Lease expiration date |  |  | Dec. 31, 2019 |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |  |
Operating lease, expense |  |  | $ 3,000 |  |  |

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