Fair Value Measurement (Details) - Recurring basis - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Financial and nonfinancial liabilities measured at fair value	$ 0	$ 0
Nonfinancial assets measured at fair value	0	0
Total	82,411	96,770
Level 1
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total	82,411	36,617
Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total		60,153
Money market funds
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total	82,411	36,617
Money market funds | Level 1
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total	$ 82,411	36,617
Corporate debt securities
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total		6,555
Corporate debt securities | Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total		6,555
Commercial paper
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total		53,598
Commercial paper | Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total		$ 53,598