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Equity Incentive Plan - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended
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Jun. 18, 2013 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 Stock Awards | Jun. 30, 2013 Stock Awards | Jun. 30, 2013 Stock Awards Minimum | Jun. 30, 2013 Stock Awards Minimum | Jun. 30, 2013 Stock Awards Maximum | Jun. 30, 2013 Stock Awards Maximum | Jun. 30, 2013 Restricted Stock Units (RSUs) | Mar. 31, 2013 Restricted Stock Units (RSUs) | Jun. 30, 2013 Stock Options and Restricted Stock | Jun. 30, 2013 Stock Options and Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation expense |  | $ 365,367 | $ 312,563 | $ 788,326 | $ 633,073 |  |  |  |  |  |  |  |  |  |
Increase in shares reserved for grant under stock option and incentive plan | 650,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares reserved for grant under stock option and incentive plan | 3,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options granted to employees |  | 20,000 |  | 374,500 |  |  |  |  |  |  |  |  |  |  |
Restricted stock units granted to Board of Directors |  |  |  |  |  |  |  |  |  |  |  | 0 | 13,800 |  |
Stock option and incentive plan, vesting period |  |  |  |  |  |  |  | 1 year | 1 year | 4 years | 4 years |  |  | 4 years | 4 years
Unrecognized stock-based compensation cost |  | 3,000,000 |  | 3,000,000 |  |  |  |  |  |  |  |  |  |  |
Unrecognized stock-based compensation cost, weighted-average recognition period |  |  |  | 2 years 10 months 24 days |  |  |  |  |  |  |  |  |  |  |
Intrinsic value of stock options and SARs |  |  |  | 599,010 | 1,241,759 |  |  |  |  |  |  |  |  |  |
Cash received from exercise of stock options |  | 30,859 | 32,377 | 1,127,875 | 147,033 |  |  |  |  |  |  |  |  |  |
Options and SARs outstanding |  | 1,900,000 |  | 1,900,000 |  |  |  |  |  |  |  |  |  |  |
Weighted average exercise price per share |  | $ 8.60 |  | $ 8.60 |  |  |  |  |  |  |  |  |  |  |
Intrinsic value of Options and SARs |  | $ 16,200,000 |  | $ 16,200,000 |  |  |  |  |  |  |  |  |  |  |
Weighted average remaining contractual term |  | 6 years 3 months 7 days |  | 6 years 3 months 7 days |  |  |  |  |  |  |  |  |  |  |
Stock based awards, contractual term |  |  |  |  |  | 10 years | 10 years |  |  |  |  |  |  |  |

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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 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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 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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