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8. Fair Value of Warrants (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Expected dividend yield 0.00%us-gaap_FairValueAssumptionsExpectedDividendRate  
Exercise price $ 0.01us-gaap_FairValueAssumptionsExercisePrice  
Company stock price $ 3.88us-gaap_SharePrice $ 4.20us-gaap_SharePrice
Minimum [Member]    
Risk-free interest rate 0.56%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Expected volatility 78.34%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Expected Life (years), min 2 years 2 months 12 days  
Maximum [Member]    
Risk-free interest rate 0.73%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Expected volatility 79.43%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
 
Expected Life (years), min 2 years 9 months 18 days