Accrued expenses and other current liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Accrued expenses and other current liabilities
Accrued employee compensation and benefits expense	$ 2,321	$ 3,569
Accrued vendor expenses	1,588	5,500
Accrued warranty expense	935	598
Deferred rent, current portion		131
Accrued taxes	237	781
Other	200	338
Accrued expenses and other current liabilities	$ 5,281	$ 10,917