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Balance Sheet Components - Components of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Property Plant And Equipment [Line Items]
Total property and equipment, gross	$ 16,061	$ 14,388
Less: accumulated depreciation and amortization	(5,853)	(5,230)
Total property and equipment, net	10,208	9,158
Laboratory and Manufacturing Equipment
Property Plant And Equipment [Line Items]
Total property and equipment, gross	3,120	2,750
Computer Equipment and Software
Property Plant And Equipment [Line Items]
Total property and equipment, gross	1,062	1,062
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Total property and equipment, gross	925	925
Leasehold Improvements
Property Plant And Equipment [Line Items]
Total property and equipment, gross	726	726
Internal-Use Software
Property Plant And Equipment [Line Items]
Total property and equipment, gross	$ 10,228	$ 8,925

X

- Definition

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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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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