Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Details)

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Fair Value Measurements (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Convertible Debt          
Summary of financial instruments measured at fair value on a recurring basis          
Credit losses $ 0 $ 0 $ 0 $ 0  
Other-than-temporary impairment losses 0 $ 0 0 $ 0  
Money Market Funds          
Summary of financial instruments measured at fair value on a recurring basis          
Money market funds 67,218,000   67,218,000   $ 86,095,000
Level 1 | Money Market Funds          
Summary of financial instruments measured at fair value on a recurring basis          
Money market funds 67,218,000   67,218,000   86,095,000
Level 2 | Money Market Funds          
Summary of financial instruments measured at fair value on a recurring basis          
Money market funds 0   0   0
Level 3 | Money Market Funds          
Summary of financial instruments measured at fair value on a recurring basis          
Money market funds $ 0   $ 0   $ 0