Fair Value Measurements and Fair Value of Financial Instruments - Schedule of Financial Instruments Measured on Recurring Basis (Details) - Fair Value, Recurring - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Assets:
Assets fair value	$ 390,823	$ 413,508
Liabilities:
Liabilities fair value	2,484	4,080
Commercial Paper
Assets:
Assets fair value	129,369	141,676
US Treasury Bills [Member]
Assets:
Assets fair value	110,358	26,590
Money Market Investments (Included in Cash and Cash Equivalents)
Assets:
Assets fair value	64,730	181,528
Corporate Debt Securities
Assets:
Assets fair value	64,207	38,649
Us Government Agency Bonds [Member]
Assets:
Assets fair value	22,159	25,065
MSKCC Success Payments Liability
Liabilities:
Liabilities fair value	2,484	4,080
Level 1
Assets:
Assets fair value	175,088	208,118
Level 1 | US Treasury Bills [Member]
Assets:
Assets fair value	110,358	26,590
Level 1 | Money Market Investments (Included in Cash and Cash Equivalents)
Assets:
Assets fair value	64,730	181,528
Level 2
Assets:
Assets fair value	215,735	205,390
Level 2 | Commercial Paper
Assets:
Assets fair value	129,369	141,676
Level 2 | Corporate Debt Securities
Assets:
Assets fair value	64,207	38,649
Level 2 | Us Government Agency Bonds [Member]
Assets:
Assets fair value	22,159	25,065
Level 3
Liabilities:
Liabilities fair value	2,484	4,080
Level 3 | MSKCC Success Payments Liability
Liabilities:
Liabilities fair value	$ 2,484	$ 4,080