Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Assets and Liabilities from Continuing Operations (Details)

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Fair Value Measurements - Assets and Liabilities from Continuing Operations (Details) - Recurring basis - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Quoted prices in active markets for identical assets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments in money market funds $ 54,010 $ 17,503
Significant other observable inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments in money market funds 0 0
Significant unobservable inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments in money market funds $ 0 $ 0