Severance and Other Exit Costs - Summary of Total Restructuring Charges Recorded in the Consolidated Statements of Operations and Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 1,682	$ 2,015
Cost of revenue
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	142	1,267
Sales and marketing
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	569	220
Engineering and development
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	446	414
General and administrative
Restructuring Cost and Reserve [Line Items]
Total restructuring charges	$ 525	$ 114