Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

v2.4.0.8
Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Accounting Policies [Abstract]      
Maturity of highly liquid debt instruments 3 months    
Uncollectible $ 0   $ 0
Allowance for doubtful accounts 0   0
Inventories, net of reserve 416,000   538,000
Forfeiture allocation $ 0 $ 0