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Balance Sheet Components - Property and Equipment, net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property and Equipment, net
Property and equipment, gross	$ 83,402	$ 64,807
Less: Accumulated depreciation and amortization	(50,054)	(41,524)
Total Property and Equipment, net	33,348	23,283
Impairment		1,671	$ 1,544
Impairment of leasehold improvements		1,200
Impairment of capitalized software		100
Impairment of right-of-use assets		400
Selling, general and administrative
Property and Equipment, net
Impairment		1,700
Machinery and equipment
Property and Equipment, net
Property and equipment, gross	51,001	36,414
Furniture and fixtures
Property and Equipment, net
Property and equipment, gross	$ 1,376	1,376
Useful Life	3 years
Computer equipment
Property and Equipment, net
Property and equipment, gross	$ 2,428	1,828
Useful Life	3 years
Capitalized software held for internal use
Property and Equipment, net
Property and equipment, gross	$ 7,417	5,917
Useful Life	3 years
Leasehold improvements
Property and Equipment, net
Property and equipment, gross	$ 14,810	11,556
Construction-in-process
Property and Equipment, net
Property and equipment, gross	$ 6,370	$ 7,716
Minimum \| Machinery and equipment
Property and Equipment, net
Useful Life	3 years
Maximum \| Machinery and equipment
Property and Equipment, net
Useful Life	5 years