Quarterly report pursuant to Section 13 or 15(d)

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

v3.4.0.3
Stock-Based Awards and Per Share Information - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 10, 2016
Feb. 26, 2016
Mar. 31, 2016
Mar. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Compensation cost related to stock options     $ 834,000 $ 700,000
Net impact of share based compensation expense to earnings per basic share     $ (0.01) $ (0.01)
Net impact of share based compensation expense to earnings per diluted share     $ (0.01) $ (0.01)
Total unrecognized compensation cost     $ 4,300,000  
Unrecognized share based compensation cost to be recognized over weighted-average period     2 years 9 months 18 days  
Outstanding stock options and warrants excluded from diluted loss per share     15,228,000 15,563,000
Warrants        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Warrants exercised     0  
Restricted Stock Units (RSUs)        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Granted     658,000  
Restricted Stock Units (RSUs) | President And Chief Executive Officer        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Awards issued per share   $ 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]        
Percentage on performance optional vesting   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]        
Percentage on performance optional vesting   50.00%    
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     11,550,000  
Common stock issued pursuant to options exercised     3,098,000  
Options and restricted stock units outstanding     5,134,000  
Options available for future grants     3,318,000  
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   $ 0.86    
Options expiration period   10 years    
Two Thousand Sixteen Compensation Plan | Stock Options | Vest on January 2, 2016 | 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, Award Vesting Period   48 months    
Two Thousand Sixteen Compensation Plan | Stock Options | CFO Grant Award Tranche Two | 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, Award Vesting Period   36 months    
Percentage on performance optional vesting   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   $ 0.86    
Granted   140,000    
Two Thousand Sixteen Compensation Plan | Restricted Stock Units (RSUs) | Vest on January 2, 2016 | Employees and Consultants        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Percentage on performance optional vesting   25.00%    
Two Thousand Sixteen Compensation Plan | Restricted Stock Units (RSUs) | CFO Grant Award Tranche Two | Employees and Consultants        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Percentage on performance optional vesting   25.00%    
Two Thousand Sixteen Compensation Plan | Restricted Stock Units (RSUs) | CFO Grant Award Tranche Three | Employees and Consultants        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Percentage on performance optional vesting   25.00%    
Two Thousand Sixteen Compensation Plan | Restricted Stock Units (RSUs) | CFO Grant Award Tranche Four | Employees and Consultants        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Percentage on performance optional vesting   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   $ 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 $ 1.23      
Granted 70,000