Short-Term Investments - Summary of Investments Included in Cash Equivalents and Short Term Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Schedule Of Cash Cash Equivalents And Available For Sale Securities [Line Items]
Cash equivalents and short-term investments, Amortized Cost	$ 206,382	$ 261,955
Cash equivalents and short-term investments, Unrealized Gains	11	183
Cash equivalents and short-term investments, Fair Value	206,393	262,138
Money Market Mutual Funds
Schedule Of Cash Cash Equivalents And Available For Sale Securities [Line Items]
Cash equivalents and short-term investments, Amortized Cost	127,395	39,524
Cash equivalents and short-term investments, Fair Value	127,395	39,524
Repurchase Agreements
Schedule Of Cash Cash Equivalents And Available For Sale Securities [Line Items]
Cash equivalents and short-term investments, Amortized Cost		14,000
Cash equivalents and short-term investments, Fair Value		14,000
Commercial Paper
Schedule Of Cash Cash Equivalents And Available For Sale Securities [Line Items]
Cash equivalents and short-term investments, Amortized Cost	6,997	41,259
Cash equivalents and short-term investments, Fair Value	6,997	41,259
Corporate Debt Securities
Schedule Of Cash Cash Equivalents And Available For Sale Securities [Line Items]
Cash equivalents and short-term investments, Amortized Cost	6,007	92,380
Cash equivalents and short-term investments, Unrealized Gains	5	128
Cash equivalents and short-term investments, Fair Value	6,012	92,508
U.S Treasury Securities
Schedule Of Cash Cash Equivalents And Available For Sale Securities [Line Items]
Cash equivalents and short-term investments, Amortized Cost	65,983	59,926
Cash equivalents and short-term investments, Unrealized Gains	6	45
Cash equivalents and short-term investments, Fair Value	$ 65,989	59,971
Asset-backed Securities
Schedule Of Cash Cash Equivalents And Available For Sale Securities [Line Items]
Cash equivalents and short-term investments, Amortized Cost		14,866
Cash equivalents and short-term investments, Unrealized Gains		10
Cash equivalents and short-term investments, Fair Value		$ 14,876