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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

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