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19. Income taxes (Details) (USD $) | Dec. 31, 2012
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Income Taxes Details |
Net operating loss carryforward | $ 18,050,294
Amortization | (580,145)
Stock option compensation | 904,334
Deferred compensation | 883,794
Deferred state tax | (477,307)
Other | 449,209
Valuation allowance | (19,230,179)
Net deferred tax asset |

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