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Prepaid expenses and other current assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Prepaid expenses and other current assets    
Prepaid insurance $ 2,621 $ 355
Prepaid commitment fee on notes payable   275
Contract asset 1,065 471
Deposits 1,415 1,148
Lease receivables, current portion 282 325
Other 17 546
Prepaid expenses and other current assets $ 5,400 $ 3,120