Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Summary of Values of Short-term Investments (Details)

v3.21.2
Fair Value Measurements - Summary of Values of Short-term Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Mutual Fund    
Schedule Of Available For Sale Securities [Line Items]    
Short-term investments, Cost $ 583 $ 580
Short-term investments, Unrealized Gains 15 10
Short-term investments, Fair Value 598 590
Certificates of Deposit    
Schedule Of Available For Sale Securities [Line Items]    
Short-term investments, Cost 35,849 4,253
Short-term investments, Fair Value $ 35,849 $ 4,253