Segments (Details) Revenue by Geography - 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
Segment Reporting Information [Line Items]
Revenues	$ 105,483	$ 99,276	$ 92,199	$ 86,978	$ 82,640	$ 78,164	$ 73,392	$ 69,760	$ 383,936	$ 303,956	$ 242,667
UNITED STATES
Segment Reporting Information [Line Items]
Revenues									316,138	246,280	195,297
CANADA
Segment Reporting Information [Line Items]
Revenues									$ 67,798	$ 57,676	$ 47,370