Assets - Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 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	97,861	$ 69,561
Short-term investments
Total Short-term investments	95,672	48,189
Measured at fair value on a recurring basis \| Certificate of deposits and time deposits
Cash equivalents
Total Cash equivalents	59,227	65,571
Measured at fair value on a recurring basis \| U.S. treasuries
Cash equivalents
Total Cash equivalents	24,958	3,990
Short-term investments
Total Short-term investments	81,727	37,184
Measured at fair value on a recurring basis \| Corporate debt
Cash equivalents
Total Cash equivalents	3,001
Short-term investments
Total Short-term investments	5,006	8,516
Measured at fair value on a recurring basis \| Commercial paper
Cash equivalents
Total Cash equivalents	10,675
Short-term investments
Total Short-term investments	8,939	2,489
Measured at fair value on a recurring basis \| Level 1
Cash equivalents
Total Cash equivalents	84,185	69,561
Short-term investments
Total Short-term investments	81,727	37,184
Measured at fair value on a recurring basis \| Level 1 \| Certificate of deposits and time deposits
Cash equivalents
Total Cash equivalents	59,227	65,571
Measured at fair value on a recurring basis \| Level 1 \| U.S. treasuries
Cash equivalents
Total Cash equivalents	24,958	3,990
Short-term investments
Total Short-term investments	81,727	37,184
Measured at fair value on a recurring basis \| Level 2
Cash equivalents
Total Cash equivalents	13,676
Short-term investments
Total Short-term investments	13,945	11,005
Measured at fair value on a recurring basis \| Level 2 \| Corporate debt
Cash equivalents
Total Cash equivalents	3,001
Short-term investments
Total Short-term investments	5,006	8,516
Measured at fair value on a recurring basis \| Level 2 \| Commercial paper
Cash equivalents
Total Cash equivalents	10,675
Short-term investments
Total Short-term investments	$ 8,939	$ 2,489

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+ References

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