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Short-term Investments (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Investments, Debt and Equity Securities [Abstract] |  |
Interest receivable | $ 600 | $ 500
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 259,183 | 258,290
Unrealized Gains | 7 | 15
Unrealized Losses | (5) | (1)
Fair Value | 259,185 | 258,304
Money market funds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 125,378 | 79,387
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 125,378 | 79,387
U.S. Treasury notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 49,123 | 59,382
Unrealized Gains | 7 | 7
Unrealized Losses | 0 | 0
Fair Value | 49,130 | 59,389
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 57,067 | 68,018
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 57,067 | 68,018
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 27,615 | 48,494
Unrealized Gains | 0 | 8
Unrealized Losses | (5) | (1)
Fair Value | 27,610 | 48,501
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost |  | 3,009
Unrealized Gains |  | 0
Unrealized Losses |  | 0
Fair Value |  | 3,009
Cash equivalents |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 125,378 | 79,387
Cash equivalents | Money market funds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 125,378 | 79,387
Cash equivalents | U.S. Treasury notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 0 | 0
Cash equivalents | Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 0 | 0
Cash equivalents | Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 0 | 0
Cash equivalents | Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value |  | 0
Short-term Investments |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 133,807 | 178,917
Short-term Investments | Money market funds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 0 | 0
Short-term Investments | U.S. Treasury notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 49,130 | 59,389
Short-term Investments | Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | 57,067 | 68,018
Short-term Investments | Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value | $ 27,610 | 48,501
Short-term Investments | Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value |  | $ 3,009

X
- 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=121645371&loc=d3e27161-111563 + Details
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