Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation - Additional Information (Detail)

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Basis of Presentation - Additional Information (Detail) (USD $)
3 Months Ended
Mar. 31, 2013
Agreement
Segment
Dec. 31, 2012
Mar. 31, 2012
Dec. 31, 2011
May 07, 2013
Subsequent Event
Basis of Presentation [Line Items]          
Number of operating segment 1        
Working capital $ 5,200,000        
Cash and cash equivalents 1,229,000 2,543,000 2,772,000 3,307,000  
Net accounts receivable 10,644,000 11,680,000      
Lines of credit remaining borrowing capacity 4,700,000        
Number revolving credit facility agreements 2        
Period of financial resources The working capital and borrowings available under the lines of credit should be sufficient to fund the requirements of the Company.        
Lines of credit borrowing capacity $ 8,000,000       $ 10,000,000