Quarterly report pursuant to Section 13 or 15(d)

Fair Value (Details)

v3.21.1
Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Fair Value    
Investments at fair value $ 26,397 $ 35,852
Estimate Of Fair Value Fair Value Disclosure    
Fair Value    
Investments at fair value 38,233 55,339
U.S. treasury bills    
Fair Value    
Investments at fair value   10,034
Government-sponsored enterprises securities    
Fair Value    
Investments at fair value 3,001 4,920
Corporate bonds and commercial paper    
Fair Value    
Investments at fair value 23,396 20,898
Fair value inputs Level 1    
Fair Value    
Investments at fair value 11,836 19,487
Fair value inputs Level 2    
Fair Value    
Investments at fair value 26,397 35,852
Fair value measurements recurring | Money market funds | Estimate Of Fair Value Fair Value Disclosure    
Fair Value    
Investments at fair value 11,836 19,487
Fair value measurements recurring | U.S. treasury bills | Estimate Of Fair Value Fair Value Disclosure    
Fair Value    
Investments at fair value   10,034
Fair value measurements recurring | Government-sponsored enterprises securities | Estimate Of Fair Value Fair Value Disclosure    
Fair Value    
Investments at fair value 3,001 4,920
Fair value measurements recurring | Corporate bonds and commercial paper | Estimate Of Fair Value Fair Value Disclosure    
Fair Value    
Investments at fair value 23,396 20,898
Fair value measurements recurring | Fair value inputs Level 1 | Money market funds    
Fair Value    
Investments at fair value 11,836 19,487
Fair value measurements recurring | Fair value inputs Level 2 | U.S. treasury bills    
Fair Value    
Investments at fair value   10,034
Fair value measurements recurring | Fair value inputs Level 2 | Government-sponsored enterprises securities    
Fair Value    
Investments at fair value 3,001 4,920
Fair value measurements recurring | Fair value inputs Level 2 | Corporate bonds and commercial paper    
Fair Value    
Investments at fair value $ 23,396 $ 20,898