Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Financial Instruments (Details)

v3.22.1
Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Fair value    
Transfers between Level 2 and Level 3 $ 0 $ 0
Letter of credit collateral 1,300  
Adjusted cost    
Fair value    
Cash 10,176 9,459
Total 49,975 68,234
Fair Value    
Fair value    
Cash 10,176 9,459
Total 49,975 68,234
Cash and Cash Equivalents | Fair Value    
Fair value    
Cash 8,865 8,148
Total 48,664 66,923
Restricted Cash | Fair Value    
Fair value    
Cash 1,311 1,311
Total 1,311 1,311
Level 1 | Adjusted cost    
Fair value    
Investments 39,799 58,775
Level 1 | Fair Value    
Fair value    
Investments 39,799 58,775
Level 1 | Money market mutual funds | Adjusted cost    
Fair value    
Investments 39,799 58,775
Level 1 | Money market mutual funds | Fair Value    
Fair value    
Investments 39,799 58,775
Level 1 | Cash and Cash Equivalents | Fair Value    
Fair value    
Investments 39,799 58,775
Level 1 | Cash and Cash Equivalents | Money market mutual funds | Fair Value    
Fair value    
Investments $ 39,799 $ 58,775