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Equity Awards - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
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12 Months Ended |
|
Dec. 31, 2014
|
Dec. 31, 2013
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Dec. 31, 2012
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
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| Authorized shares for issuance |
11,000,000 |
|
|
| Share-based compensation expense |
$ 1.8 |
$ 1.8 |
$ 2.7 |
| Non-employee director stock option |
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|
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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|
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| Vesting rights |
vest upon grant |
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| Expiration period |
10 years |
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| Officer and management non-qualified time - based stock options |
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|
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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|
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| Vesting rights |
one to three years from the date of grant |
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| Expiration period |
7 years |
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| Service and performance-based employee and director stock options |
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|
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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|
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| Unrecognized compensation cost |
5.0 |
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| Weighted average period over which unearned share-based compensation cost is expected to be recognized |
2 years 1 month 1 day |
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| Restricted stock award |
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|
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
|
|
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| Granted |
146,155 |
295,336 |
320,414 |
| Weighted average period over which unearned share-based compensation cost is expected to be recognized |
1 year 3 months 18 days |
|
|
| Weighted-average grant date fair value |
$ 3.07 |
$ 1.29 |
$ 1.20 |
| Vesting period |
3 years |
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|
| Unrecognized compensation cost |
$ 0.5 |
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