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Revenue (Tables)
 9 Months Ended
Sep. 30, 2020
Revenue from Contract with Customer [Abstract]  
Revenues disaggregated by category The following table presents our revenues disaggregated by category:​
​
Three Months Ended
September 30,		Nine Months Ended
September 30,
​
2020201920202019
Product revenue
$35,857 60 %$92,582 58 %$163,781 58 %$273,716 56 %
Rental revenue
9,881 17 %35,528 22 %57,579 21 %113,601 23 %
Field service and other revenue
14,051 23 %32,698 20 %59,116 21 %100,859 21 %
Total revenue
$59,789 100 %$160,808 100 %$280,476 100 %$488,176 100 %