Quarterly report pursuant to Section 13 or 15(d)

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

v2.4.0.8
Stock-Based Awards and Per Share Information - Additional Information (Detail) (USD $)
0 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended
Jul. 22, 2014
Jul. 18, 2014
Jul. 13, 2014
Feb. 10, 2014
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Jul. 18, 2014
Common Stock
Jul. 18, 2014
Additional Paid In Capital
Jul. 13, 2014
Non-qualified Stock Options
Sep. 30, 2014
Non-qualified Stock Options
Sep. 30, 2014
Non-qualified Stock Options
Share-based Compensation Award, Tranche One
Sep. 30, 2014
Non-qualified Stock Options
Share-based Compensation Award, Tranche Two
Jul. 13, 2014
Restricted stock units (RSUs)
Sep. 30, 2014
Restricted stock units (RSUs)
Aug. 27, 2014
Restricted stock units (RSUs)
One Independent Directors
Aug. 27, 2014
Restricted stock units (RSUs)
Four Independent Director
Sep. 30, 2014
Restricted stock units (RSUs)
Share-based Compensation Award, Tranche One
Sep. 30, 2014
Restricted stock units (RSUs)
Share-based Compensation Award, Tranche Two
Sep. 30, 2014
Comerica Bank
Sep. 30, 2013
Comerica Bank
Sep. 30, 2014
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                                               9,250,000
Common stock issued pursuant to options exercised         2,993,000   2,993,000                                  
Common stock shares reserved for future issuance         3,815,000   3,815,000   4,441,000                              
Options available for future grant                       172,282       37,879               2,442,000
Compensation cost recognized         $ 301,000 $ 491,000 $ 887,000 $ 1,239,000                                
Net impact of share based compensation expense to earnings per basic share         $ (0.01) $ (0.02) $ (0.02) $ (0.04)                                
Net impact of share based compensation expense to earnings per diluted share         $ (0.01) $ (0.02) $ (0.02) $ (0.04)                                
Total unrecognized compensation cost         2,000,000   2,000,000                                  
Unrecognized share based compensation cost to be recognized over weighted-average period             1 year 1 month 6 days                                  
Common stock shares issued 6,250,000     1,945,525                                   38,708 40,465  
Outstanding stock options and warrants excluded from diluted loss per share         4,703,000 6,022,000 4,703,000 6,022,000                                
Stock options, exercise price                       $ 1.98       $ 1.98                
Stock option and Restricted stock units vesting description     One-sixth of the stock options and one-sixth of the RSUs vested immediately, with the remaining five-sixths vesting ratably on a monthly basis over the twelve-month period ending on July 13, 2015.                                          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage                           16.67% 83.33%         16.67% 83.33%      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period                         12 months       12 months   12 months          
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price                       $ 1.31                        
Expected term         4 years 3 years 8 months 12 days 3 years 9 months 26 days 3 years 7 months 28 days       3 years 7 months 6 days                        
Volatility         85.65% 83.00% 94.41% 83.00%       98.37%                        
Risk-free interest rate         1.65% 1.54% 1.66% 0.99%       1.65%                        
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period                                   9,217 36,868          
Share-based compensation arrangement by share-based payment award, equity instruments other than options, value per share                                     $ 2.17          
Retired Shares of stock held in treasury   1,963,500                                            
Treasury stock retired                   $ 2,000 $ 16,397,000                          
Annual stock dividend policy for 2014             0.50%                                  
Dividends declared, date of record             Mar. 14, 2014