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Available-for-Sale Securities and Fair Value Measurements - Available-for-Sale Securities (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Available-for-Sale Securities |  |
Amortized Cost | $ 228,259 | $ 108,977
Gross Unrealized Gains | 33 | 0
Gross Unrealized Losses | 0 | (3)
Estimated Fair Value | $ 228,292 | 108,974
Maturity period for marketable securities |  |
Maximum contractual maturity | 1 year |
Weighted average maturity | 2 months |
U.S. government securities |  |
Available-for-Sale Securities |  |
Amortized Cost | $ 49,012 | 29,736
Gross Unrealized Gains | 25 | 0
Gross Unrealized Losses | 0 | (3)
Estimated Fair Value | 49,037 | 29,733
U.S. government agencies |  |
Available-for-Sale Securities |  |
Amortized Cost | 19,919 | 4,971
Gross Unrealized Gains | 8 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 19,927 | 4,971
U.S. corporate notes |  |
Available-for-Sale Securities |  |
Amortized Cost |  | 2,875
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Estimated Fair Value |  | 2,875
U.S. commercial paper |  |
Available-for-Sale Securities |  |
Amortized Cost | 38,747 | 22,037
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 38,747 | 22,037
Money market funds |  |
Available-for-Sale Securities |  |
Amortized Cost | 120,581 | 49,358
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | $ 120,581 | $ 49,358

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- Definition The maximum maturity period for marketable debt securities in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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