Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation - 2009 Stock Option Plan (Details)

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Stock-based Compensation - 2009 Stock Option Plan (Details) - 6 months ended Jun. 30, 2015 - 2009 Stock Option Plan [Member]
Total
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Expiration period of options 10 years
Minimum [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Percentage of exercise price 100.00%
Vesting period of options 3 years
Maximum [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Percentage of exercise price 110.00%
Vesting period of options 4 years