Balance Sheet Components - Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 45,410	$ 42,430
Less: accumulated depreciation and amortization	(31,322)	(25,625)
Property, plant and equipment, net	14,088	16,805
Finance lease equipment (included in machinery and equipment)	888
Finance lease equipment (included in machinery and equipment)		888
Less: accumulated depreciation	$ (514)
Less: accumulated depreciation		(381)
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Property, plant and equipment, net
Finance lease equipment, net	$ 374
Finance lease equipment, net		507
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	34,703	32,688
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	6,117	5,905
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,486	1,479
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	360	360
Software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,375	1,357
Assets under construction
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,369	$ 641

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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