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Net Loss Per Common Share (Details) - shares
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Outstanding shares of common stock equivalents that have been excluded from diluted net loss per common share        
Total common stock equivalents (in shares) 6,417,696 5,341,516 6,226,855 5,066,188
Shares of common stock subject to outstanding options        
Outstanding shares of common stock equivalents that have been excluded from diluted net loss per common share        
Total common stock equivalents (in shares) 6,322,215 5,312,081 6,134,966 5,031,926
Employee stock purchase plan        
Outstanding shares of common stock equivalents that have been excluded from diluted net loss per common share        
Total common stock equivalents (in shares) 25,481 29,435 31,944 34,262
Restricted stock units        
Outstanding shares of common stock equivalents that have been excluded from diluted net loss per common share        
Total common stock equivalents (in shares) 70,000 0 59,945 0