Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 55,066	$ 49,513
Revenue, as a percent	100.00%	100.00%
Video
Disaggregation of Revenue [Line Items]
Revenue	$ 28,633	$ 20,229
Revenue, as a percent	52.00%	40.90%
Subscription and other in-app products
Disaggregation of Revenue [Line Items]
Revenue	$ 14,395	$ 15,596
Revenue, as a percent	26.10%	31.50%
User pay revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 43,028	$ 35,825
Revenue, as a percent	78.10%	72.40%
Advertising revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 12,038	$ 13,688
Revenue, as a percent	21.90%	27.60%