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Summary of Stock Option and Stock Award Activities (Details) - $ / shares
 6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Options outstanding beginning of period 1,068,515  
Number of Options, Granted 137,380  
Number of Options, Forfeited and cancelled (6,866)  
Options outstanding end of the period 1,199,029 1,068,515
Options exercisable, end of period, Number of Options 660,493  
Options vested and expected to vest, Number of Options 1,197,613  
Weighted Average exercise Price, Options Outstanding, Beginning of period $ 2.89  
Weighted average exercise price, Granted 0.69  
Weighted average exercise price, Forfeited and cancelled 1.69  
Weighted Average exercise Price, Options Outstanding, end of period 2.64 $ 2.89
Weighted average exercise price, Options exercisable, end of period 3.62  
Weighted Average exercise Price, Options vested and expected to vest, end of period $ 2.65  
Weighted Average Remaining Contractual Term (in years) Options Outstanding 7 years 11 months 1 day 8 years 3 months
Options exercisable, Weighted Average Remaining Contractual Term (in years) 7 years 4 months 2 days  
Options vested and expected to vest, Weighted Average Remaining Contractual Term (in years) 7 years 11 months 1 day