Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Financial Assets Measured at Fair Value on Recurring Basis (Details)

v3.19.3
Fair Value Measurements - Financial Assets Measured at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Cash equivalents:    
Total $ 71,041 $ 33,017
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Cash equivalents:    
Total 71,041 33,017
Money Market Funds    
Cash equivalents:    
Total 71,041 33,017
Money Market Funds | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Cash equivalents:    
Total $ 71,041 $ 33,017