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Common Stock (Details) - $ / shares
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Common Stock, Authorized (in shares) 150,000,000 132,000,000
Par value of common stock (in dollars per share) $ 0.001 $ 0.001
Common Stock, Issued, (in shares) 15,313,297 493,200
Common Stock, Outstanding (in shares) 15,313,297 493,200
Common Stock, Dividends, Per Share, Declared $ 0  
Shares reserved for future issuance (in shares) 2,799,213 9,445,451
Series A Convertible Preferred Stock    
Shares reserved for future issuance (in shares)   5,356,996
Series B Convertible Preferred Stock    
Shares reserved for future issuance (in shares)   2,655,992
Warrants for the purchase of Preferred Stock    
Shares reserved for future issuance (in shares)   12,283
Warrants for the purchase of Common Stock    
Shares reserved for future issuance (in shares) 59,405 34,839
Options to purchase Common Stock    
Shares reserved for future issuance (in shares) 2,557,456 1,385,341
Employee Stock Purchase Plan    
Shares reserved for future issuance (in shares) 182,352