Assets - Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 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	138,794	$ 78,493
Short-term investments
Total Short-term investments	79,429	115,252
Measured at fair value on a recurring basis \| U.S. treasuries
Short-term investments
Total Short-term investments	52,507	105,130
Measured at fair value on a recurring basis \| Government agency securities
Short-term investments
Total Short-term investments	5,976	1,139
Measured at fair value on a recurring basis \| Corporate debt
Short-term investments
Total Short-term investments	7,015	6,002
Measured at fair value on a recurring basis \| Commercial paper
Short-term investments
Total Short-term investments	13,931	2,981
Measured at fair value on a recurring basis \| Certificate of deposits and time deposits
Cash equivalents
Total Cash equivalents	81,796	67,009
Measured at fair value on a recurring basis \| Government money market fund
Cash equivalents
Total Cash equivalents	47,500
Measured at fair value on a recurring basis \| Commercial paper
Cash equivalents
Total Cash equivalents	9,498	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	129,296	67,009
Short-term investments
Total Short-term investments	52,507	105,130
Measured at fair value on a recurring basis \| Level 1 \| U.S. treasuries
Short-term investments
Total Short-term investments	52,507	105,130
Measured at fair value on a recurring basis \| Level 1 \| Certificate of deposits and time deposits
Cash equivalents
Total Cash equivalents	81,796	67,009
Measured at fair value on a recurring basis \| Level 1 \| Government money market fund
Cash equivalents
Total Cash equivalents	47,500
Measured at fair value on a recurring basis \| Level 2
Cash equivalents
Total Cash equivalents	9,498	11,484
Short-term investments
Total Short-term investments	26,922	10,122
Measured at fair value on a recurring basis \| Level 2 \| Government agency securities
Short-term investments
Total Short-term investments	5,976	1,139
Measured at fair value on a recurring basis \| Level 2 \| Corporate debt
Short-term investments
Total Short-term investments	7,015	6,002
Measured at fair value on a recurring basis \| Level 2 \| Commercial paper
Short-term investments
Total Short-term investments	13,931	2,981
Measured at fair value on a recurring basis \| Level 2 \| Commercial paper
Cash equivalents
Total Cash equivalents	$ 9,498	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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