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Field equipment, net
 12 Months Ended
Dec. 31, 2021
Field Equipment [Abstract]  
Field equipment, net Field equipment, net
The following table sets forth the Company’s field equipment, net:
December 31,
20212020
Field equipment$33,789 $27,876 
Accumulated depreciation(20,866)(16,646)
Field equipment, net$12,923 $11,230 
Depreciation expense was $6,355, $5,117 and $4,631 for the years ended December 31, 2021, 2020 and 2019, respectively. Write downs of $639, $409 and $327 were identified for the years ended December 31, 2021, 2020 and 2019, respectively.