Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Contract balances from contracts with customers (Details)

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Summary of Significant Accounting Policies - Contract balances from contracts with customers (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Summary of Significant Accounting Policies    
Current portion of contract assets $ 1,459 $ 0
Long-term contract assets 3,418 $ 0
Recognition of revenue that was previously included in the deferred revenue balance 2,300  
Rollforward of deferred revenue    
Balance at the beginning 4,197  
Revenue recognized (10,877)  
Revenue deferred 15,845  
Balance at the end $ 9,165