Quarterly report pursuant to Section 13 or 15(d)

Description of Business and Basis of Presentation - Additional Information (Detail)

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Description of Business and Basis of Presentation - Additional Information (Detail) (USD $)
 0 Months Ended 9 Months Ended
Nov. 03, 2014
Jul. 28, 2014
Jul. 22, 2014
Feb. 10, 2014
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Basis Of Presentation [Line Items]                
Proceeds from equity offering, gross     $ 12,000,000 $ 5,000,000        
Working capital         7,300,000      
Cash and cash equivalents         2,759,000 4,151,000 1,440,000 2,543,000
Net accounts receivable         9,264,000   11,127,000  
Common stock shares issued     6,250,000 1,945,525        
Common stock issued, price per share     $ 1.92 $ 2.57        
Proceeds from equity offering, net of expenses     11,500,000 4,800,000 16,302,000 4,592,000    
Payments of stock issuance costs     491,000 200,000        
Payments under revolving lines of credit   2,900,000            
Term of agreement 3 years              
Subsequent Event
                
Basis Of Presentation [Line Items]                
Proceeds from equity offering, gross $ 35,000,000              
Common stock shares issued 14,162,873              
Common stock issued, price per share $ 2.39              
Warrants to purchase common stock 9,205,862              
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 4.00              
Term of agreement 3 years