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Property and Equipment, net - Summary of Property and Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 2,552	$ 2,510
Less accumulated depreciation and amortization	(2,247)	(2,116)
Property and equipment - net	305	394
Laboratory Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	1,538	1,529
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	216	185
Office Furniture and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	217	217
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 581	$ 579

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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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