Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Awards and Per Share Information - Additional Information (Detail)

v3.5.0.2
Stock-Based Awards and Per Share Information - Additional Information (Detail)
3 Months Ended 9 Months Ended
Sep. 15, 2016
$ / shares
shares
Aug. 29, 2016
$ / shares
shares
Aug. 08, 2016
shares
May 06, 2016
$ / shares
shares
Apr. 18, 2016
VicePresident
$ / shares
shares
Mar. 10, 2016
$ / shares
shares
Feb. 26, 2016
$ / shares
shares
Sep. 30, 2016
USD ($)
$ / shares
shares
Sep. 30, 2015
USD ($)
$ / shares
shares
Sep. 30, 2016
USD ($)
$ / shares
shares
Sep. 30, 2015
USD ($)
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Common stock issued pursuant to options exercised                   1,000  
Compensation cost related to stock options | $               $ 688,000 $ 621,000 $ 2,500,000 $ 2,300,000
Net impact of share based compensation expense to earnings per basic share | $ / shares               $ 0.01 $ 0.01 $ 0.04 $ 0.04
Net impact of share based compensation expense to earnings per diluted share | $ / shares               $ 0.01 $ 0.01 $ 0.04 $ 0.04
Total unrecognized compensation cost | $               $ 4,300,000   $ 4,300,000  
Unrecognized share based compensation cost to be recognized over weighted-average period                   2 years 6 months  
Number of newly hired vice presidents | VicePresident         2            
Outstanding stock options, restricted stock units and warrants excluded from diluted loss per share               17,636,000 15,536,000 17,636,000 15,536,000
Warrants | Private Placement                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Granted     2,035,000                
Stock Options | Vice Presidents                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Stock options granted 250,000       325,000            
Awards issued per share | $ / shares $ 1.78       $ 1.43            
Options expiration period 10 years       10 years            
Share-based Compensation Arrangement by Share-based Payment Award, Monthly Ratable Award Vesting Period 36 months       36 months            
Share Based Compensation Arrangement By Share Based Payment Award, Vesting Commencement Date Sep. 15, 2017       Apr. 18, 2017            
Percentage of time based vesting for options 75.00%       75.00%            
Stock Options | Non-Employee Directors                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Stock options granted       597,757              
Awards issued per share | $ / shares       $ 1.41              
Options expiration period       10 years              
Share-based Compensation Arrangement by Share-based Payment Award, Monthly Ratable Award Vesting Period       12 months              
Share Based Compensation Arrangement By Share Based Payment Award, Vesting Commencement Date       Jun. 06, 2016              
Stock Options | Senior Director                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Stock options granted   60,000                  
Awards issued per share | $ / shares   $ 1.65                  
Options expiration period   10 years                  
Share-based Compensation Arrangement by Share-based Payment Award, Monthly Ratable Award Vesting Period   48 months                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Date   Sep. 29, 2016                  
Stock Options | Awards Vesting on April 18, 2017 | Vice Presidents                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Vesting percentage         25.00%            
Stock Options | Awards Vesting on September 15, 2017 | Vice Presidents                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Vesting percentage 25.00%                    
Restricted Stock Units (RSUs)                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Granted                   907,000  
Restricted Stock Units (RSUs) | President And Chief Executive Officer                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Awards issued per share | $ / shares             $ 0.86        
Granted             59,523        
Maximum performance bonus awarded | $                   $ 100,000  
Restricted Stock Units (RSUs) | Vesting on March 30, 2016 | President And Chief Executive Officer                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Vesting percentage             50.00%        
Restricted Stock Units (RSUs) | Vesting on February 18, 2017 | President And Chief Executive Officer                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Vesting percentage             50.00%        
Restricted Stock Units (RSUs) | Vest on May 6, 2017 | Non-Employee Directors                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Awards issued per share | $ / shares       $ 1.41              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Date       May 06, 2017              
Granted       248,750              
2002 Stock Incentive Plan                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Plan expiration date                   May 05, 2019  
Common stock authorized for issuance under the 2002 Plan               15,550,000   15,550,000  
Common stock issued pursuant to options exercised                   3,557,000  
Options and restricted stock units outstanding               6,230,000   6,230,000  
Options available for future grants               5,763,000   5,763,000  
Two Thousand Sixteen Compensation Plan | Stock Options | Employees and Consultants                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Stock options granted             295,000        
Awards issued per share | $ / shares             $ 0.86        
Options expiration period             10 years        
Two Thousand Sixteen Compensation Plan | Stock Options | Existing Employees                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Stock options granted             185,000        
Share-based Compensation Arrangement by Share-based Payment Award, Monthly Ratable Award Vesting Period             48 months        
Two Thousand Sixteen Compensation Plan | Stock Options | New Employees                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Stock options granted             110,000        
Share-based Compensation Arrangement by Share-based Payment Award, Monthly Ratable Award Vesting Period             36 months        
Two Thousand Sixteen Compensation Plan | Stock Options | Vest on February 26, 2017 | New Employees                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Vesting percentage             25.00%        
Two Thousand Sixteen Compensation Plan | Restricted Stock Units (RSUs) | Employees and Consultants                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Awards issued per share | $ / shares             $ 0.86        
Granted             140,000        
Two Thousand Sixteen Compensation Plan | Restricted Stock Units (RSUs) | Vest on February 26, 2017 | Employees and Consultants                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Vesting percentage             25.00%        
Two Thousand Sixteen Compensation Plan | Restricted Stock Units (RSUs) | Vest on February 26, 2018 | Employees and Consultants                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Vesting percentage             25.00%        
Two Thousand Sixteen Compensation Plan | Restricted Stock Units (RSUs) | Vest on February 26, 2019 | Employees and Consultants                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Vesting percentage             25.00%        
Two Thousand Sixteen Compensation Plan | Restricted Stock Units (RSUs) | Vest on February 26, 2020 | Employees and Consultants                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Vesting percentage             25.00%        
Two Thousand Fifteen Compensation Plan | Restricted Stock Units (RSUs) | Employees and Consultants                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Awards issued per share | $ / shares             $ 0.86        
Granted             388,500        
Two Thousand Fifteen Compensation Plan | Restricted Stock Units (RSUs) | Chief Financial Officer                      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                      
Awards issued per share | $ / shares           $ 1.23          
Granted           70,000