Assets - Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Short-term investments
Transfer of assets from Level 1 to Level 2	$ 0
Transfer of assets from Level 2 to Level 1	0
Transfer of Liabilities from Level 1 to Level 2	0
Transfer of Liabilities from Level 2 to Level 1	0
Measured at fair value on a recurring basis
Cash equivalents
Total Cash equivalents	60,799	$ 86,165
Short-term investments
Total Short-term investments	214,635	189,771
Measured at fair value on a recurring basis \| U.S. treasuries
Short-term investments
Total Short-term investments	124,129	149,219
Measured at fair value on a recurring basis \| Government agency securities
Short-term investments
Total Short-term investments	7,255
Measured at fair value on a recurring basis \| Corporate debt
Short-term investments
Total Short-term investments	65,666	32,554
Measured at fair value on a recurring basis \| Commercial paper
Short-term investments
Total Short-term investments	17,585	7,998
Measured at fair value on a recurring basis \| Certificate of deposits and time deposits
Cash equivalents
Total Cash equivalents	60,479	59,168
Measured at fair value on a recurring basis \| Commercial paper
Cash equivalents
Total Cash equivalents		2,000
Measured at fair value on a recurring basis \| Money market cash
Cash equivalents
Total Cash equivalents	320
Measured at fair value on a recurring basis \| U.S. treasuries
Cash equivalents
Total Cash equivalents		24,997
Measured at fair value on a recurring basis \| Level 1
Cash equivalents
Total Cash equivalents	60,799	84,165
Short-term investments
Total Short-term investments	124,129	149,219
Measured at fair value on a recurring basis \| Level 1 \| U.S. treasuries
Short-term investments
Total Short-term investments	124,129	149,219
Measured at fair value on a recurring basis \| Level 1 \| Certificate of deposits and time deposits
Cash equivalents
Total Cash equivalents	60,479	59,168
Measured at fair value on a recurring basis \| Level 1 \| Money market cash
Cash equivalents
Total Cash equivalents	320
Measured at fair value on a recurring basis \| Level 1 \| U.S. treasuries
Cash equivalents
Total Cash equivalents		24,997
Measured at fair value on a recurring basis \| Level 2
Cash equivalents
Total Cash equivalents		2,000
Short-term investments
Total Short-term investments	90,506	40,552
Measured at fair value on a recurring basis \| Level 2 \| Government agency securities
Short-term investments
Total Short-term investments	7,255
Measured at fair value on a recurring basis \| Level 2 \| Corporate debt
Short-term investments
Total Short-term investments	65,666	32,554
Measured at fair value on a recurring basis \| Level 2 \| Commercial paper
Short-term investments
Total Short-term investments	$ 17,585	7,998
Measured at fair value on a recurring basis \| Level 2 \| Commercial paper
Cash equivalents
Total Cash equivalents		$ 2,000

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