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Cash and Cash Equivalents, Investments and Fair Value Measurements - Schedule of Available For Sale Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | $ 637,987 |
Fair Value | 631,786 |
Cash and cash equivalents: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 94,419 | $ 473,677
Unrealized Gain | 0 | 0
Unrealized Loss | 0 | 0
Fair Value | 94,419 | 473,677
Cash and cash equivalents: | Cash |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 42,015 | 33,532
Unrealized Gain | 0 | 0
Unrealized Loss | 0 | 0
Fair Value | 42,015 | 33,532
Cash and cash equivalents: | Money market funds | Level 1 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 52,404 | 440,145
Unrealized Gain | 0 | 0
Unrealized Loss | 0 | 0
Fair Value | 52,404 | 440,145
Short-term investments: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 167,830 | 588,474
Unrealized Gain | 0 | 0
Unrealized Loss | (989) | (4,501)
Fair Value | 166,841 | 583,973
Short-term investments: | Commercial paper | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost |  | 11,744
Unrealized Gain |  | 0
Unrealized Loss |  | (29)
Fair Value |  | 11,715
Short-term investments: | Corporate debt securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 58,911 | 491,459
Unrealized Gain | 0 | 0
Unrealized Loss | (258) | (4,130)
Fair Value | 58,653 | 487,329
Short-term investments: | U.S. treasury securities | Level 1 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost |  | 85,271
Unrealized Gain |  | 0
Unrealized Loss |  | (342)
Fair Value |  | 84,929
Short-term investments: | Agency bonds | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 108,919 |
Unrealized Gain | 0 |
Unrealized Loss | (731) |
Fair Value | 108,188 |
Long-term investments: |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 417,753 | 217,003
Unrealized Gain | 8 | 280
Unrealized Loss | (5,220) | (1,050)
Fair Value | 412,541 | 216,233
Long-term investments: | Corporate debt securities | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 220,649 | 125,735
Unrealized Gain | 8 | 158
Unrealized Loss | (2,598) | (909)
Fair Value | 218,059 | 124,984
Long-term investments: | U.S. treasury securities | Level 1 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 98,462 | 30,633
Unrealized Gain | 0 | 122
Unrealized Loss | (1,248) | 0
Fair Value | 97,214 | 30,755
Long-term investments: | Agency bonds | Level 2 |  |
Debt Securities, Available-for-sale [Line Items] |  |
Adjusted Cost | 98,642 | 60,635
Unrealized Gain | 0 | 0
Unrealized Loss | (1,374) | (141)
Fair Value | $ 97,268 | $ 60,494

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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://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 + Details
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