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Basis of Presentation and Summary of Significant Accounting Policies - Investment Categories (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Equity Securities, FV-NI [Abstract] |  |
Estimated fair value | $ 4,621 | $ 9,910
Debt and Equity Securities, FV-NI [Abstract] |  |
Amortized cost | 630,227 | 941,174
Gross unrealized gains | 671 | 933
Gross unrealized losses | (9,614) | (2,118)
Estimated fair value | 621,284 | 939,989
Bank deposits |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 284,855 | 411,690
Gross unrealized gains | 157 | 188
Gross unrealized losses | (1,398) | (3)
Estimated fair value | 283,614 | 411,875
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 62,191 | 63,818
Gross unrealized gains | 21 | 161
Gross unrealized losses | (1,666) | 0
Estimated fair value | 60,546 | 63,979
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 127,928 | 210,525
Gross unrealized gains | 5 | 43
Gross unrealized losses | (273) | (16)
Estimated fair value | 127,660 | 210,552
Corporate equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 4,506 | 4,506
Gross unrealized gains | 430 | 416
Gross unrealized losses | (3,483) | (1,850)
Estimated fair value | 1,453 | 3,072
Mutual fund |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 150,747 | 250,635
Gross unrealized gains | 0 | 0
Gross unrealized losses | (2,794) | (249)
Estimated fair value | 147,953 | 250,386
Warrants |  |
Equity Securities, FV-NI [Abstract] |  |
Amortized cost | 0 | 0
Gross unrealized gains | 58 | 125
Gross unrealized losses | 0 | 0
Estimated fair value | $ 58 | $ 125

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