Revenue - Disaggregated by Category (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Total revenues	$ 115,363	$ 59,789	$ 308,673	$ 280,476
Revenue as a percentage	100.00%	100.00%	100.00%	100.00%
Product revenue
Disaggregation of Revenue [Line Items]
Total revenues	$ 74,835	$ 35,857	$ 197,136	$ 163,781
Revenue as a percentage	65.00%	60.00%	64.00%	58.00%
Rental revenue
Disaggregation of Revenue [Line Items]
Total revenues	$ 15,271	$ 9,881	$ 42,404	$ 57,579
Revenue as a percentage	13.00%	17.00%	14.00%	21.00%
Field service and other revenue
Disaggregation of Revenue [Line Items]
Total revenues	$ 25,257	$ 14,051	$ 69,133	$ 59,116
Revenue as a percentage	22.00%	23.00%	22.00%	21.00%