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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Depreciation and amortization, nonproduction $ 163 $ 177 $ 530 $ 498
Stock-based compensation expense 1,355 1,077 3,907 3,732
Selling, general and administrative expenses        
Stock-based compensation expense 1,254 1,011 3,521 3,356
System rental        
Depreciation and amortization, production 6,250 6,052 18,578 18,087
Stock-based compensation expense 8 (14) 20 16
System services        
Depreciation and amortization, production 234 172 596 803
Stock-based compensation expense 89 76 349 349
Transloading services        
Depreciation and amortization, production 0 0 0 411
Stock-based compensation expense 4 4 17 11
Inventory software services        
Depreciation and amortization, production $ 195 $ 193 $ 584 $ 579