Quarterly report pursuant to Section 13 or 15(d)

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

v3.8.0.1
Description of Business and Basis of Presentation - Additional Information (Detail) - USD ($)
 9 Months Ended
Apr. 18, 2017
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Description Of Business And Basis Of Presentation [Line Items]        
Proceeds from equity offering, net of expenses   $ 10,395,000 $ 9,541,000  
Working capital   14,700,000    
Cash and cash equivalents, including restricted cash   4,700,000    
Accounts receivable   9,708,000   $ 9,784,000
Minimum        
Description Of Business And Basis Of Presentation [Line Items]        
Expected gross proceeds from rights offering   8,000,000    
Maximum        
Description Of Business And Basis Of Presentation [Line Items]        
Expected gross proceeds from rights offering   12,000,000    
Private Placement        
Description Of Business And Basis Of Presentation [Line Items]        
Proceeds from equity offering, gross $ 10,500,000 $ 10,500,000    
Payments of stock issuance costs 200,000      
Proceeds from equity offering, net of expenses $ 10,300,000