Quarterly report pursuant to Section 13 or 15(d)

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

v3.2.0.727
Stock-Based Awards and Per Share Information - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 13, 2015
Mar. 09, 2015
Nov. 07, 2014
Jun. 30, 2015
Feb. 28, 2014
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Common stock issued pursuant to options exercised               38,000    
Compensation cost related to stock options           $ 935 $ 276 $ 1,635 $ 586  
Net impact of share based compensation expense to earnings per basic share           $ (0.02) $ (0.01) $ (0.03) $ (0.02)  
Net impact of share based compensation expense to earnings per diluted share           $ (0.02) $ (0.01) $ (0.03) $ (0.02)  
Total unrecognized compensation cost       $ 4,500   $ 4,500   $ 4,500    
Unrecognized share based compensation cost to be recognized over weighted-average period           2 years 10 months 24 days        
Granted               3,096,000    
Expected term           5 years 6 months 4 years 2 months 12 days 5 years 10 months 24 days 3 years 9 months 18 days  
Volatility           87.70% 96.50% 91.01% 97.91%  
Risk-free interest rate           1.54% 1.69% 1.65% 1.66%  
Outstanding stock options and warrants excluded from diluted loss per share           16,251,000 4,942,000 16,251,000 4,942,000  
Annual Stock Dividend Payable Rate         0.50%          
Dividends Payable, Date of Record         Mar. 14, 2014          
Percentage of stock dividend declared               0.00%    
Private Placement                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Outstanding warrants included in connection with November 2014     9,206,000              
CFO Grant Award Tranche One                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Granted   523,026                
Share based compensation arrangement by share Based payment award fair value price   $ 1.48                
Expected term   6 years 1 month 6 days                
Volatility   88.79%                
Risk-free interest rate   1.83%                
CFO Grant Award Tranche Two                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Granted   348,684                
Share based compensation arrangement by share Based payment award fair value price   $ 1.70                
Expected term   10 years                
Volatility   87.87%                
Risk-free interest rate   2.19%                
Warrants                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Restricted stock units outstanding       888,000   888,000   888,000   888,000
Warrants exercised           0 0 0 0  
Subsequent Event                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Shares vested and exercised consecutive term 36 months                  
Shares vested and exercisable date Jul. 13, 2016                  
Restricted Stock Units (RSUs)                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Restricted stock units outstanding       37,000   37,000   37,000    
Restricted Stock Units (RSUs) | Subsequent Event | President and Chief Executive Officer                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Number of shares awarded 870,000                  
Non Qualified Stock Options | Chief Financial Officer                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Granted   871,710                
Exercise Price of Stock Options   $ 1.99                
Options expiration period   10 years                
Non Qualified Stock Options | Subsequent Event | President and Chief Executive Officer                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Granted 870,000                  
Exercise Price of Stock Options $ 1.65                  
Options expiration period 10 years                  
Options vesting period 4 years                  
One Year Anniversary | CFO Grant Award Tranche One                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Option shares vested and exercised   130,757                
Shares vested and exercised consecutive term   35 months                
Shares vested and exercisable date   Mar. 09, 2016                
One Year Anniversary | Subsequent Event                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Option shares vested and exercised 217,500                  
One Month Anniversary | CFO Grant Award Tranche One                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Option shares vested and exercised   10,896                
One Month Anniversary | Subsequent Event                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Option shares vested and exercised 18,125                  
Thirty Six Month Anniversary | CFO Grant Award Tranche One                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Option shares vested and exercised   10,909                
Shares vested and exercisable date   Mar. 09, 2019                
Ten Year Anniversary | CFO Grant Award Tranche Two                    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                    
Option shares vested and exercised   248,684                
Shares vested and exercisable date   Mar. 09, 2025   Jun. 23, 2015            
Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Number       100,000            
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   11,550,000   11,550,000    
Common stock issued pursuant to options exercised               3,031,000    
Options and restricted stock units outstanding       6,157,000   6,157,000   6,157,000    
Options available for future grants       2,362,000   2,362,000   2,362,000