Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Summary of Fair Value Assets Measured on Recurring Basis for Cash, Cash Equivalents and Marketable Securities (Details)

v3.20.1
Fair Value Measurements - Summary of Fair Value Assets Measured on Recurring Basis for Cash, Cash Equivalents and Marketable Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Cash and cash equivalents $ 208,362 $ 198,037
Fair Value Measurements Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Adjusted cost 208,362 209,086
Gross unrealized gains   8
Fair value 208,362 209,094
Cash and cash equivalents 208,362 198,037
Marketable securities   11,057
Fair Value Measurements Recurring | Cash    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Adjusted cost 50,238 51,560
Fair value 50,238 51,560
Cash and cash equivalents 50,238 51,560
Fair Value Measurements Recurring | Level 1 | Money Market Accounts    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Adjusted cost 158,124 146,477
Fair value 158,124 146,477
Cash and cash equivalents $ 158,124 146,477
Fair Value Measurements Recurring | Level 2 | Corporate Bonds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Adjusted cost   2,011
Gross unrealized gains   2
Fair value   2,013
Marketable securities   2,013
Fair Value Measurements Recurring | Level 2 | U.S. Treasury Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Adjusted cost   9,038
Gross unrealized gains   6
Fair value   9,044
Marketable securities   $ 9,044