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Basis of Presentation and Summary of Significant Accounting Policies - Investment Categories (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Equity Securities, FV-NI [Abstract] |  |
Estimated fair value | $ 6,581 | $ 9,910
Debt and Equity Securities, FV-NI [Abstract] |  |
Amortized cost | 299,291 | 941,174
Gross unrealized gains | 1,037 | 933
Gross unrealized losses | (2,624) | (2,118)
Estimated fair value | 297,704 | 939,989
Bank deposits |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 68,226 | 411,690
Gross unrealized gains | 101 | 188
Gross unrealized losses | 0 | (3)
Estimated fair value | 68,327 | 411,875
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 27,125 | 63,818
Gross unrealized gains | 102 | 161
Gross unrealized losses | 0 | 0
Estimated fair value | 27,227 | 63,979
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 47,943 | 210,525
Gross unrealized gains | 60 | 43
Gross unrealized losses | 0 | (16)
Estimated fair value | 48,003 | 210,552
Corporate equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 4,484 | 4,506
Gross unrealized gains | 415 | 416
Gross unrealized losses | (2,624) | (1,850)
Estimated fair value | 2,275 | 3,072
Mutual fund |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 151,513 | 250,635
Gross unrealized gains | 204 | 0
Gross unrealized losses | 0 | (249)
Estimated fair value | 151,717 | 250,386
Warrants |  |
Equity Securities, FV-NI [Abstract] |  |
Amortized cost | 0 | 0
Gross unrealized gains | 155 | 125
Gross unrealized losses | 0 | 0
Estimated fair value | $ 155 | $ 125

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