Equity-Based Compensation - Summary of Equity-Based Compensation Expenses as Part of Cost of Revenue and Operating Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Equity-based compensation expense	$ 588	$ 549	$ 1,706	$ 1,538
Cost of Revenue
Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Equity-based compensation expense	121	133	396	341
Research and Development
Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Equity-based compensation expense	214	194	517	602
Selling and Marketing
Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Equity-based compensation expense	115	93	336	213
General and Administrative
Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Equity-based compensation expense	$ 138	$ 129	$ 457	$ 382