|
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 | |||||||||||||||||||||||