Income Taxes (Details 3) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation of the Company's effective income tax rate to the federal statutory rate
Federal income tax at the statutory rate	$ 7,913,977	$ (3,370,059)	$ (1,789,837)
State income taxes, net of federal benefit	968,902	(357,226)	(103,651)
Permanent differences	330,216	680,742	870,757
Research and development	(327,256)	(229,694)	(163,883)
Return to provision adjustment	(270,134)	(458,172)	265,028
Change in liability for unrecognized tax benefits	920,497	(299,441)	17,061
Change in valuation allowance	(1,428,572)	1,428,572
Other	(234,010)	16,403	175,140
Provision (benefit) for income taxes	$ 7,873,620	$ (2,588,875)	$ (729,385)
Effective tax rate	34.80%	26.90%	14.30%

Income tax reconciliation change in liability for unrecognized tax benefits.

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Income tax reconciliation permanent difference.

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Income tax reconciliation return to provision adjustment.

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A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to changes in the valuation allowance for deferred tax assets in the period.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to nondeductible research and development expenses, including in-process research and development acquired as part of a business combination, under enacted tax laws.

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The portion of the difference, between total income tax expense or benefit as reported in the Income Statement for the year/accounting period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to all other items not otherwise listed in the existing taxonomy.

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The portion of the difference, between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to state and local income tax expense or benefit.

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