Revenues - Revenues by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenue from contract with customers	$ 171,851	$ 130,837	$ 112,362	$ 115,810	$ 114,791	$ 104,836	$ 99,226	$ 101,215	$ 530,860	$ 420,068	$ 343,798
Concentration risk, percentage									100.00%	100.00%	100.00%
United States
Disaggregation of Revenue [Line Items]
Revenue from contract with customers									$ 446,100	$ 335,310	$ 282,810
Concentration risk, percentage									84.00%	79.80%	82.30%
Other Countries
Disaggregation of Revenue [Line Items]
Revenue from contract with customers									$ 84,760	$ 84,758	$ 60,988
Concentration risk, percentage									16.00%	20.20%	17.70%