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Prepaid and other current assets (Tables)
12 Months Ended
Dec. 31, 2021
Prepaid Expense and Other Assets, Current [Abstract]  
Schedule of Prepaid and Other Current Assets

Prepaid and other current assets consisted of the following:
(in thousands)
​ ​
December 31,
2021
​ ​
December 31,
2020
Vendor deposits
​ ​
$13,098
​ ​
$4,205
Prepaid expenses
​ ​
2,301
​ ​
821
Prepaid taxes
​ ​
269
​ ​
222
Deferred cost of revenue
​ ​
—
​ ​
992
Surety collateral
​ ​
460
​ ​
113
Other current assets
​ ​
1,058
​ ​
571
Total
​ ​
$17,186
​ ​
$6,924