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Prepaid expenses and other current assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Prepaid expenses and other current assets    
Prepaid insurance $ 131 $ 1,622
Contract asset 123 396
Deposits 1,009 1,262
Lease receivables, current portion 103 231
Other 633 440
Prepaid expenses and other current assets $ 1,999 $ 3,951