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Field Equipment, Net
 12 Months Ended
Dec. 31, 2019
Field Equipment [Abstract]  
Field Equipment, Net Field equipment, net
The following table sets forth the Company’s field equipment, net:
December 31,
20192018
Field equipment$21,075  $17,380  
Accumulated depreciation(13,391) (10,456) 
Field equipment, net$7,684  $6,924  
Depreciation expense was $4,631, $5,553 and $4,483 for the years ended December 31, 2019, 2018 and 2017, respectively. Write downs of $326, $350, and $195 were identified for the years ended December 31, 2019, 2018 and 2017, respectively.