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Line of credit
 12 Months Ended
Dec. 31, 2021
Debt Disclosure [Abstract]  
Line of credit Line of credit
In October 2017, the Company entered into a loan agreement for a revolving line of credit facility (“Line of Credit”) with a borrowing capacity of $0.5 million. The Line of Credit is secured by substantially all of the Company’s assets and was secured in order to provide credit support for a letter of credit facility and balances under the Company’s credit cards.
Borrowings under the Line of Credit are subject to a variable interest rate, based on changes in the Prime Rate, as calculated published by the Wall Street Journal. There were no borrowings on the Line of Credit as of December 31, 2021 and 2020.