Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Total Revenue	$ 133,316	$ 95,540	$ 240,590	$ 191,425
Micro-Transactions | Over-time revenue recognition
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	116,907	82,659	212,846	166,203
Advertisements and offers | Point-in-time revenue recognition
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	16,374	12,864	27,703	25,194
Other | Point-in-time revenue recognition
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 35	$ 17	$ 41	$ 28