Balance Sheet Components - Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 44,684	$ 38,551
Less: accumulated depreciation and amortization	(23,206)	(17,767)
Property and equipment, net	21,478	20,784
Computers
Property, Plant and Equipment [Line Items]
Total property and equipment	13,041	9,249
Capitalized internal-use software
Property, Plant and Equipment [Line Items]
Total property and equipment	14,178	10,041
Office equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	3,375	2,770
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property and equipment	8,395	9,472
Motor vehicles
Property, Plant and Equipment [Line Items]
Total property and equipment	1,421	2,423
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	4,274	4,274
Construction in progress
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 0	$ 322