Investments and Fair Value Measurements - Schedule of Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, gross unrealized losses	$ (3)	$ (10)
Less than 12 months, fair value	1,260	49,499
U.S. treasury
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, gross unrealized losses	0	(1)
Less than 12 months, fair value	0	12,926
U.S. agency securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, gross unrealized losses	0	(9)
Less than 12 months, fair value	0	36,322
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Less than 12 months, gross unrealized losses	(3)	0
Less than 12 months, fair value	$ 1,260	$ 251