Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended		48 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016
Accounting Policies [Abstract]
Impairment of investments			$ 0
Based on these sales prices reduced inventory and increased cost of goods sold	$ 204,000	$ 815,000	1,100,000	$ 1,100,000
Book value of property	1,600,000		1,600,000		$ 1,600,000
Asset impairment charge	265,000		265,000
Revenue recorded from government contract	112,000	$ 144,000	209,000	$ 286,000	4,200,000
Total value of the contract	$ 4,700,000		$ 4,700,000		$ 4,700,000
Number of outstanding warrants	0		0		0