Segment Reporting - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) Segment	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | Segment	1
Description of long-lived assets located	Substantially all of our long-lived assets are located in the United States.
Total revenue	$ 112,287	$ 78,479	$ 63,763
United States
Segment Reporting Information [Line Items]
Total revenue	$ 25,900	$ 21,000	$ 19,600