Annual report pursuant to Section 13 and 15(d)

The Company - Additional Information (Detail)

v3.7.0.1
The Company - Additional Information (Detail)
 1 Months Ended 12 Months Ended
Jan. 26, 2017
USD ($)
Mar. 11, 2016
Jun. 30, 2016
USD ($)
May 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Segment
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items]                
Number of reportable segments | Segment         1      
Reverse stock split   0.1            
Liquidity         $ 1,900,000 $ 2,800,000    
Cash and cash equivalents         883,000 219,000 $ 6,033,000 $ 1,757,000
Additional borrowing capacity under the Revolving Credit Facility         1,000,000 2,600,000    
Line of credit facility, maximum borrowing amount         $ 27,000,000      
Line of credit facility, maturity date         Oct. 04, 2017      
Issuance of common stock, net of issuance fees       $ 15,200,000 $ 16,192,000 8,960,000 $ 8,614,000  
Issuance of common stock in a private placement     $ 1,000,000   1,000,000      
Working capital         $ 51,300,000 $ 25,900,000    
Subsequent Event                
Organization And Summary Of Significant Accounting Policies [Line Items]                
Increase in maximum borrowing capacity $ 13,000,000              
Line of credit facility, maximum borrowing amount $ 50,000,000              
Line of credit facility, maturity date Jan. 26, 2020