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Significant Balance Sheet Components - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Property Plant And Equipment [Line Items] |  |
Computer equipment | $ 6,193 | $ 6,422
Less: accumulated depreciation and amortization | (5,350) | (4,980)
Property and equipment, Net | 843 | 1,442
Computer Equipment |  |
Property Plant And Equipment [Line Items] |  |
Computer equipment | 4,858 | 5,087
Software |  |
Property Plant And Equipment [Line Items] |  |
Computer equipment | 981 | 981
Furniture, Fixtures, and Office Equipment |  |
Property Plant And Equipment [Line Items] |  |
Computer equipment | 175 | 175
Leasehold Improvements |  |
Property Plant And Equipment [Line Items] |  |
Computer equipment | $ 179 | $ 179

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