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Common Stock - Reserved Shares of Common Stock Issuance on Converted Basis (Details) - shares
Dec. 31, 2015
Dec. 31, 2014
Equity [Abstract]    
Shares Outstanding 0 18,703,071
Options issued and outstanding 5,270,751 2,147,872
Warrants issued to purchase stock   81,620
Shares available for future stock option grants 2,401,406 1,896,617
Total 7,672,157 22,829,180