Assets - Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
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	148,474	$ 78,493
Short-term investments
Total Short-term investments	112,279	115,252
Measured at fair value on a recurring basis \| U.S. treasuries
Short-term investments
Total Short-term investments	77,746	105,130
Measured at fair value on a recurring basis \| Government agency securities
Short-term investments
Total Short-term investments	5,995	1,139
Measured at fair value on a recurring basis \| Corporate debt
Short-term investments
Total Short-term investments	12,078	6,002
Measured at fair value on a recurring basis \| Commercial paper
Short-term investments
Total Short-term investments	16,460	2,981
Measured at fair value on a recurring basis \| Certificate of deposits and time deposits
Cash equivalents
Total Cash equivalents	94,303	67,009
Measured at fair value on a recurring basis \| Government money market fund
Cash equivalents
Total Cash equivalents	48,172
Measured at fair value on a recurring basis \| Commercial paper
Cash equivalents
Total Cash equivalents	5,999	10,484
Measured at fair value on a recurring basis \| Corporate debt
Cash equivalents
Total Cash equivalents		1,000
Measured at fair value on a recurring basis \| Level 1
Cash equivalents
Total Cash equivalents	142,475	67,009
Short-term investments
Total Short-term investments	77,746	105,130
Measured at fair value on a recurring basis \| Level 1 \| U.S. treasuries
Short-term investments
Total Short-term investments	77,746	105,130
Measured at fair value on a recurring basis \| Level 1 \| Certificate of deposits and time deposits
Cash equivalents
Total Cash equivalents	94,303	67,009
Measured at fair value on a recurring basis \| Level 1 \| Government money market fund
Cash equivalents
Total Cash equivalents	48,172
Measured at fair value on a recurring basis \| Level 2
Cash equivalents
Total Cash equivalents	5,999	11,484
Short-term investments
Total Short-term investments	34,533	10,122
Measured at fair value on a recurring basis \| Level 2 \| Government agency securities
Short-term investments
Total Short-term investments	5,995	1,139
Measured at fair value on a recurring basis \| Level 2 \| Corporate debt
Short-term investments
Total Short-term investments	12,078	6,002
Measured at fair value on a recurring basis \| Level 2 \| Commercial paper
Short-term investments
Total Short-term investments	16,460	2,981
Measured at fair value on a recurring basis \| Level 2 \| Commercial paper
Cash equivalents
Total Cash equivalents	$ 5,999	10,484
Measured at fair value on a recurring basis \| Level 2 \| Corporate debt
Cash equivalents
Total Cash equivalents		$ 1,000

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