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Share-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2013
Share-Based Compensation |
Schedule of the compensation cost charged against income for plans |
|  | Three Months Ended |  | Nine Months Ended |
|  | September 30, |  | September 30, |
|  | 2013 |  | 2012 |  | 2013 |  | 2012 |
Selling, general & administrative expense |  | $ | 199,967 |  | $ | 182,286 |  | $ | 707,453 |  | $ | 679,340 |
Schedule of stock option activity under all plans |
|  | Shares Under Options |  | Weighted Average Exercise Price |  | Aggregate Intrinsic Value |
Outstanding at December 31, 2012 |  | 493,888 |  | $ | 5.47 |  |  |
Granted |  | 97,362 |  | 19.74 |  |  |
Exercised |  | (117,500 | ) | 2.85 |  |  |
Cancelled or expired |  | — |  | — |  |  |
Outstanding at September 30, 2013 |  | 473,750 |  | $ | 9.05 |  | $ | 6,498,890 |
Options exercisable at September 30, 2013 |  | 367,500 |  | $ | 6.31 |  | $ | 6,048,878 |
Vested and expected to vest at September 30, 2013 |  | 473,750 |  | $ | 9.05 |  | $ | 6,498,890 |
Schedule of assumptions used to determine the fair value of options using Black Scholes option pricing model |
Expected volatility | 34.0% - 50.0%
Expected dividends | none
Risk free interest rate | 0.4% - 0.7%
Expected term | 3.3 to 5.0 years
Summary of Restricted Stock Units ( RSUs ) activity |
|  | Restricted Stock Units |  | Weighted Average Award Date Fair Value |
Unvested at December 31, 2012 |  | 108,866 |  | $ | 8.77 |
Awarded |  | 10,600 |  | 19.97 |
Shares vested |  | (61,635 | ) | 6.67 |
Forfeited / cancelled |  | (6,931 | ) | 13.23 |
Unvested at September 30, 2013 |  | 50,900 |  | $ | 11.64 |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + 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 SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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