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Property and equipment, net (Tables)
12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Schedule of Property and Equipment

Property and equipment consisted of the following:
(in thousands)
​ ​
December 31,
2021
​ ​
December 31,
2020
Leasehold improvements
​ ​
$    22
​ ​
$11
Field equipment
​ ​
833
​ ​
66
Information technology equipment
​ ​
182
​ ​
—
Tooling
​ ​
543
​ ​
—
Capitalized software
​ ​
250
​ ​
250
Total
​ ​
1,830
​ ​
327
Accumulated depreciation
​ ​
(248)
​ ​
(16)
Property and equipment, net
​ ​
$1,582
​ ​
$311
Schedule of Depreciation Expense

We recognized depreciation expense associated with our property and equipment each period as follows:
 
​ ​
Year ended December 31,
(in thousands)
​ ​
2021
​ ​
2020
​ ​
2019
Tangible asset depreciation
​ ​
$170
​ ​
$14
​ ​
$12
Capitalized software depreciation
​ ​
62
​ ​
—
​ ​
—
Total depreciation expense
​ ​
$232
​ ​
$14
​ ​
$12