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Field Equipment, Net
 12 Months Ended
Dec. 31, 2020
Field Equipment [Abstract]  
Field Equipment, Net Field equipment, net
The following table sets forth the Company’s field equipment, net:
December 31,
20202019
Field equipment$27,876 $21,075 
Accumulated depreciation(16,646)(13,391)
Field equipment, net$11,230 $7,684 
Depreciation expense was $5,117, $4,631 and $5,553 for the years ended December 31, 2020, 2019 and 2018, respectively. Write downs of $409, $327 and $350 were identified for the years ended December 31, 2020, 2019 and 2018, respectively.