Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Company's assets that were accounted for at fair value on a recurring basis
Short-term investments		$ 24,962
Recurring
Company's assets that were accounted for at fair value on a recurring basis
Total	$ 47,109	38,911
Recurring | Level 1
Company's assets that were accounted for at fair value on a recurring basis
Total	47,109	38,911
Recurring | Money market funds
Company's assets that were accounted for at fair value on a recurring basis
Cash equivalents	47,109	13,949
Recurring | Money market funds | Level 1
Company's assets that were accounted for at fair value on a recurring basis
Cash equivalents	$ 47,109	13,949
Recurring | U.S. Treasury securities
Company's assets that were accounted for at fair value on a recurring basis
Short-term investments		24,962
Recurring | U.S. Treasury securities | Level 1
Company's assets that were accounted for at fair value on a recurring basis
Short-term investments		$ 24,962