Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.2
Fair Value Measurements - Summary of Values of Short-term Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Mutual Fund    
Schedule Of Available For Sale Securities [Line Items]    
Short-term investments, Cost $ 578 $ 5,129
Short-term investments, Unrealized Gains 1 1
Short-term investments, Unrealized Losses   (6)
Short-term investments, Fair value 579 $ 5,124
Certificates of Deposit    
Schedule Of Available For Sale Securities [Line Items]    
Short-term investments, Cost 4,559  
Short-term investments, Fair value $ 4,559