Quarterly report pursuant to Section 13 or 15(d)

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

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Fair Value Measurements - Summary of Values of Short-term Investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mutual Fund    
Schedule Of Available For Sale Securities [Line Items]    
Short-term investments, Cost $ 587 $ 580
Short-term investments, Unrealized gains 6 10
Short-term investments, Fair value 593 590
Certificates of Deposit    
Schedule Of Available For Sale Securities [Line Items]    
Short-term investments, Cost 3,694 4,253
Short-term investments, Fair value $ 3,694 $ 4,253