Quarterly report pursuant to Section 13 or 15(d)

The Company - Additional Information (Detail)

v3.8.0.1
The Company - Additional Information (Detail)
3 Months Ended 9 Months Ended
Jan. 26, 2017
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Segment
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items]              
Number of reportable segments | Segment       1      
Revenue from sales tax   $ 1,100,000 $ 1,500,000 $ 3,000,000 $ 3,700,000    
Line of credit facility, maximum borrowing amount $ 50,000,000            
Line of credit facility, maturity date Jan. 26, 2020            
Liquidity   8,600,000   8,600,000   $ 1,900,000  
Cash and cash equivalents   917,000 $ 3,911,000 917,000 $ 3,911,000 883,000 $ 219,000
Additional borrowing capacity under the Revolving Credit Facility   7,700,000   7,700,000   1,000,000  
Working capital   $ 58,500,000   $ 58,500,000   $ 51,300,000