Assets - Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
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	98,037	$ 69,561
Short-term investments
Total Short-term investments	67,215	48,189
Measured at fair value on a recurring basis \| Certificate of deposits and time deposits
Cash equivalents
Total Cash equivalents	66,863	65,571
Measured at fair value on a recurring basis \| U.S. treasuries
Cash equivalents
Total Cash equivalents	19,917	3,990
Short-term investments
Total Short-term investments	51,726	37,184
Measured at fair value on a recurring basis \| Government agency securities
Short-term investments
Total Short-term investments	4,964
Measured at fair value on a recurring basis \| Corporate debt
Short-term investments
Total Short-term investments	1,999	8,516
Measured at fair value on a recurring basis \| Commercial paper
Cash equivalents
Total Cash equivalents	11,257
Short-term investments
Total Short-term investments	8,526	2,489
Measured at fair value on a recurring basis \| Level 1
Cash equivalents
Total Cash equivalents	86,780	69,561
Short-term investments
Total Short-term investments	51,726	37,184
Measured at fair value on a recurring basis \| Level 1 \| Certificate of deposits and time deposits
Cash equivalents
Total Cash equivalents	66,863	65,571
Measured at fair value on a recurring basis \| Level 1 \| U.S. treasuries
Cash equivalents
Total Cash equivalents	19,917	3,990
Short-term investments
Total Short-term investments	51,726	37,184
Measured at fair value on a recurring basis \| Level 2
Cash equivalents
Total Cash equivalents	11,257
Short-term investments
Total Short-term investments	15,489	11,005
Measured at fair value on a recurring basis \| Level 2 \| Government agency securities
Short-term investments
Total Short-term investments	4,964
Measured at fair value on a recurring basis \| Level 2 \| Corporate debt
Short-term investments
Total Short-term investments	1,999	8,516
Measured at fair value on a recurring basis \| Level 2 \| Commercial paper
Cash equivalents
Total Cash equivalents	11,257
Short-term investments
Total Short-term investments	$ 8,526	$ 2,489

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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