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Property and Equipment - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 4,672	$ 4,098
Less accumulated depreciation	(2,965)	(2,697)
Property and equipment, net	1,707	1,401
Lab Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	2,953	2,503
Computer Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	172	113
Computer Software
Property Plant And Equipment [Line Items]
Property and equipment, gross	240	194
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property and equipment, gross	281	267
Tenant Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	900	895
Other Office Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 126	$ 126

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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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