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Basis of Presentation and Summary of Significant Accounting Policies - Investment Categories (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | $ 239,039 | $ 324,567
Gross unrealized gains | 1,025 | 1,302
Gross unrealized losses | (315) | (1,391)
Estimated fair value | 239,749 | 324,478
Estimated fair value | 279,972 | 363,567
Bank deposits |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 33,560 | 84,120
Gross unrealized gains | 13 | 35
Gross unrealized losses | (2) | (1)
Estimated fair value | 33,571 | 84,154
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 25,965 | 30,512
Gross unrealized gains | 62 | 99
Gross unrealized losses | (2) | (1)
Estimated fair value | 26,025 | 30,610
Agency bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 2,500 | 4,499
Gross unrealized gains | 0 | 2
Gross unrealized losses | (1) | 0
Estimated fair value | 2,499 | 4,501
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 19,258 | 45,459
Gross unrealized gains | 12 | 27
Gross unrealized losses | 0 | (1)
Estimated fair value | 19,270 | 45,485
Corporate equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 5,807 | 4,466
Gross unrealized gains | 172 | 360
Gross unrealized losses | (310) | (1,388)
Estimated fair value | 5,669 | 3,438
Mutual fund |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 151,949 | 151,512
Gross unrealized gains | 53 | 386
Gross unrealized losses | 0 | 0
Estimated fair value | 152,002 | 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 | 713 | 393
Gross unrealized losses | 0 | 0
Estimated fair value | 713 | 393
Estimated fair value | 0 | 6,326
Common Stock |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated fair value | $ 40,223 | $ 32,763

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