Fair Value Measurements - Summary of Financial Assets Measured at Fair Value on Recurring Basis (Details) - Fair Value, Recurring - USD ($) $ in Thousands		Jun. 30, 2022		Dec. 31, 2021
Assets:
Total fair value of assets		$ 385,706		$ 450,383
Money Market Funds | Cash and Cash Equivalents
Assets:
Total fair value of assets		292,924	[1]	351,625	[2]
US Treasury Securities | Short-Term Investments
Assets:
Total fair value of assets		45,972	[3]	18,097	[4]
US Treasury Securities | Long-Term Investments
Assets:
Total fair value of assets		19,313	[5]	44,770	[6]
Corporate Debt Securities | Short-Term Investments
Assets:
Total fair value of assets		2,639	[3]	2,822	[4]
Commercial Paper | Short-Term Investments
Assets:
Total fair value of assets		23,422	[3]	31,566	[4]
Supranational Debt Securities | Short-Term Investments
Assets:
Total fair value of assets		637	[3]	1,503	[4]
Yankee Debt Security | Short-Term Investments
Assets:
Total fair value of assets	[3]	799
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Total fair value of assets		358,209		414,492
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money Market Funds | Cash and Cash Equivalents
Assets:
Total fair value of assets		292,924	[1]	351,625	[2]
Quoted Prices in Active Markets for Identical Assets (Level 1) | US Treasury Securities | Short-Term Investments
Assets:
Total fair value of assets		45,972	[3]	18,097	[4]
Quoted Prices in Active Markets for Identical Assets (Level 1) | US Treasury Securities | Long-Term Investments
Assets:
Total fair value of assets		19,313	[5]	44,770	[6]
Significant Other Observable Inputs (Level 2)
Assets:
Total fair value of assets		27,497		35,891
Significant Other Observable Inputs (Level 2) | Corporate Debt Securities | Short-Term Investments
Assets:
Total fair value of assets		2,639	[3]	2,822	[4]
Significant Other Observable Inputs (Level 2) | Commercial Paper | Short-Term Investments
Assets:
Total fair value of assets		23,422	[3]	31,566	[4]
Significant Other Observable Inputs (Level 2) | Supranational Debt Securities | Short-Term Investments
Assets:
Total fair value of assets		637	[3]	$ 1,503	[4]
Significant Other Observable Inputs (Level 2) | Yankee Debt Security | Short-Term Investments
Assets:
Total fair value of assets	[3]	$ 799

[1] Included as cash and cash equivalents on the condensed consolidated balance sheets.

[2] Included as cash and cash equivalents on the condensed consolidated balance sheets.

[3] Included as short-term marketable securities on the condensed consolidated balance sheets.

[4] Included as short-term marketable securities on the condensed consolidated balance sheets.

[5] Included as long-term marketable securities on the condensed consolidated balance sheets.

[6] Included as long-term marketable securities on the condensed consolidated balance sheets.