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Balance Sheet Components - Property (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Property and Equipment, net
Property and equipment, gross	$ 58,775		$ 58,775		$ 58,633
Less: Accumulated depreciation and amortization	(39,748)		(39,748)		(34,297)
Total Property and Equipment, net	19,027		19,027		24,336
Impairment			1,310	$ 1,544
Impairment of leasehold improvements	1,200
Impairment of capitalized software	100
Impairment of right-of-use assets	400		361
Selling, general and administrative
Property and Equipment, net
Impairment	1,700
Research and development
Property and Equipment, net
Impairment		$ 1,600
Machinery and equipment
Property and Equipment, net
Property and equipment, gross	36,317		36,317		35,400
Furniture and fixtures
Property and Equipment, net
Property and equipment, gross	1,376		$ 1,376		1,319
Useful Life			3 years
Computer equipment
Property and Equipment, net
Property and equipment, gross	2,031		$ 2,031		2,117
Useful Life			3 years
Capitalized software held for internal use
Property and Equipment, net
Property and equipment, gross	5,296		$ 5,296		4,868
Useful Life			3 years
Impairment of capitalized software			$ 100
Leasehold improvements
Property and Equipment, net
Property and equipment, gross	11,268		11,268		10,916
Construction-in-process
Property and Equipment, net
Property and equipment, gross	$ 2,487		$ 2,487		$ 4,013
Minimum \| Machinery and equipment
Property and Equipment, net
Useful Life			3 years
Maximum \| Machinery and equipment
Property and Equipment, net
Useful Life			5 years