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Cash, cash equivalents, restricted cash and available-for-sale marketable securities - Cash, Cash Equivalents, and Marketable Securities - (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Amortized Cost Basis [Abstract]    
Cash and Cash Equivalents, at Carrying Value $ 96,860 $ 117,433
Total money market funds and marketable securities 128,030 115,422
Fair Value Disclosure [Abstract]    
Total money market funds and marketable securities 127,821 115,411
Unrealized Gain and Loss [Abstract]    
Total money market funds and marketable securities (209) (11)
Debt securities, unrealized loss position 30,000 15,100
Debt securities, unrealized gain position 5,000 0
Money market funds    
Amortized Cost Basis [Abstract]    
Cash and Cash Equivalents, at Carrying Value 93,043 100,305
U.S. Treasury notes    
Amortized Cost Basis [Abstract]    
Marketable securities, amortized cost 34,987 15,117
Fair Value Disclosure [Abstract]    
Marketable securities, fair value 34,778 15,106
Unrealized Gain and Loss [Abstract]    
Marketable securities, unrealized losses $ (209) $ (11)
Maximum    
Unrealized Gain and Loss [Abstract]    
Debt securities, contractual maturity period 1 year