Business Segment Information - Summary of Revenue and Gross Profit (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting [Abstract]
Gross profit	$ 3,739	$ 15,853	$ 9,190	$ 33,511
General and administrative expenses	12,665	20,122	49,030	49,618
Sales and marketing expenses	10,000	16,974	40,709	39,161
Research and development expenses	921	2,315	2,831	4,891
Depreciation and amortization expenses	3,425	3,200	10,353	7,457
Stock-based compensation expenses	8,080	8,644	23,404	22,303
Impairment of assets			58,210
Acquisition-related expenses (income), net		(13,454)		(6,566)
Loss from equity method investments	1,420	1,837	4,495	1,837
Foreign exchange (gain) loss, net	(9,319)	2,585	5,424	1,153
Change in fair value of warrant liability	(31,913)		51,275
Interest expenses, net	10,437	8,680	30,147	26,005
Finance income from ABG		(210)		(557)
Other expense (income), net	(38)	(1,116)	4,944	(6,185)
Loss before income taxes	$ (1,939)	$ (33,724)	$ (271,632)	$ (105,606)