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Basis of Presentation and Summary of Significant Accounting Policies - Investment Categories (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Equity Securities, FV-NI [Abstract] |  |
Estimated fair value | $ 8,314 | $ 9,257
Debt and Equity Securities, FV-NI [Abstract] |  |
Amortized cost | 876,074 | 600,154
Gross unrealized gains | 1,010 | 1,226
Gross unrealized losses | (2,701) | (163)
Estimated fair value | 874,383 | 601,217
Bank deposits |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 490,828 | 311,066
Gross unrealized gains | 294 | 26
Gross unrealized losses | (11) | (29)
Estimated fair value | 491,111 | 311,063
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 58,581 | 53,223
Gross unrealized gains | 240 | 1
Gross unrealized losses | 0 | (45)
Estimated fair value | 58,821 | 53,179
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 322,160 | 225,731
Gross unrealized gains | 86 | 8
Gross unrealized losses | (29) | (76)
Estimated fair value | 322,217 | 225,663
U.S. Government bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 0 | 7,982
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | (9)
Estimated fair value | 0 | 7,973
Municipal bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 0 | 2,017
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | (4)
Estimated fair value | 0 | 2,013
Corporate equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized cost | 4,505 | 135
Gross unrealized gains | 325 | 1,191
Gross unrealized losses | (2,661) | 0
Estimated fair value | 2,169 | 1,326
Warrants |  |
Equity Securities, FV-NI [Abstract] |  |
Amortized cost | 0 | 0
Gross unrealized gains | 65 | 0
Gross unrealized losses | 0 | 0
Estimated fair value | $ 65 | $ 0

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