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Stock-Based Compensation (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Number of shares available for grant (in shares) | 1,190,426 |  |
Compensation not yet recognized | $ 2,432 |  |
Period for recognition (in years) | 1 year 8 months |  |
Vesting period (in years) | 10 years |  |
Requisite service period (in years) | 4 years |  |
Weighted-average fair value of options granted during the year (in dollars per share) | $ 1.54 | $ 2.20 | $ 1.79
Proceeds from stock options exercised | $ 0 | $ 297 | $ 811
Total intrinsic value | $ 0 | $ 103 | 520
Vested (in shares) | 351,938 | 266,091 |
Vested (in dollars per share) | $ 1,821 | $ 1,553 |
Total stock-based compensation expense | $ 1,809 | 2,322 | 1,798
Share Price (in dollars per share) | $ 1.89 |  |
Second Anniversary of Award Date |  |  |
Percent of options vesting | 50.00% |  |
Third Anniversary of Award Date |  |  |
Percent of options vesting | 25.00% |  |
Fourth Anniversary of Award Date |  |  |
Percent of options vesting | 25.00% |  |
Minimum |  |  |
Vesting period (in years) | 2 years |  |
Maximum |  |  |
Vesting period (in years) | 4 years |  |
Non-Vested Stock Options |  |  |
Compensation not yet recognized | $ 0 |  |
Weighted-average fair value of options granted during the year (in dollars per share) | $ 1.54 |  |
The First Type of Restriced Stock Units |  |  |
Vesting period (in years) | 3 years |  |
The Second Type of Restricted Stock Units |  |  |
Vesting period (in years) | 2 years |  |
The Second Type of Restricted Stock Units | Second Anniversary of Award Date |  |  |
Percent of options vesting | 67.00% |  |
The Second Type of Restricted Stock Units | Third Anniversary of Award Date |  |  |
Percent of options vesting | 33.00% |  |
The Third Type of Restricted Stock Units |  |  |
Vesting period (in years) | 2 years |  |
The Third Type of Restricted Stock Units | Second Anniversary of Award Date |  |  |
Percent of options vesting | 67.00% |  |
The Third Type of Restricted Stock Units | Third Anniversary of Award Date |  |  |
Percent of options vesting | 33.00% |  |
Restricted Stock Units (RSUs) |  |  |
Compensation not yet recognized | $ 2,432 |  |
Period for recognition (in years) | 1 year 8 months |  |
Total stock-based compensation expense | $ 1,615 | 2,086 | 2,043
Deferred directors fees |  |  |
Total stock-based compensation expense | $ 0 | $ 0 | $ 0
Reserved For Issuance Upon Exercise Or Vesting Of Equity Awards |  |  |
Number of shares reserved for future issuance | 4,400,676 |  |

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- Definition Stock options granted to employees under the Incentive Plan have a 10-year life and they vest as follows: 50% after the second anniversary of the award date, 25% after the third anniversary, and the final 25% after the fourth anniversary of the award date. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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