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Basis of Presentation and Summary of Significant Accounting Policies - Investment Categories (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | $ 257,266 | $ 324,567
Gross unrealized gains | 1,070 | 1,302
Gross unrealized losses | (726) | (1,391)
Estimated fair value | 257,610 | 324,478
Estimated fair value | 299,781 | 363,567
Bank deposits |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 47,739 | 84,120
Gross unrealized gains | 8 | 35
Gross unrealized losses | (3) | (1)
Estimated fair value | 47,744 | 84,154
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 25,914 | 30,512
Gross unrealized gains | 50 | 99
Gross unrealized losses | 0 | (1)
Estimated fair value | 25,964 | 30,610
Agency bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 2,501 | 4,499
Gross unrealized gains | 0 | 2
Gross unrealized losses | 0 | 0
Estimated fair value | 2,501 | 4,501
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 23,264 | 45,459
Gross unrealized gains | 10 | 27
Gross unrealized losses | 0 | (1)
Estimated fair value | 23,274 | 45,485
Corporate equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 5,807 | 4,466
Gross unrealized gains | 307 | 360
Gross unrealized losses | (723) | (1,388)
Estimated fair value | 5,391 | 3,438
Mutual fund |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 152,041 | 151,512
Gross unrealized gains | 53 | 386
Gross unrealized losses | 0 | 0
Estimated fair value | 152,094 | 151,898
Treasury bill |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 0 | 3,999
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Estimated fair value | 0 | 3,999
Warrants |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 0 | 0
Gross unrealized gains | 642 | 393
Gross unrealized losses | 0 | 0
Estimated fair value | 642 | 393
Estimated fair value | 0 | 6,326
Common Stock |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated fair value | $ 42,171 | $ 32,763

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