Property and Equipment, Net - Summary of Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 5,449	$ 5,244
Less accumulated depreciation and amortization	(4,941)	(4,659)
Property and equipment, net	508	585
Laboratory equipment [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	2,632	2,528
Software and computer equipment [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	449	441
Furniture and fixtures [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	153	153
Vehicles [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	204	204
Leasehold improvements [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	1,991	1,900
Assets under construction [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 20	$ 18

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(13))
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