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Net Loss Per Common Share (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Outstanding shares of common stock equivalents that have been excluded from diluted net loss per common share        
Total common stock equivalents (in shares) 6,468,116 6,417,696 6,461,659 6,226,855
Shares of common stock subject to outstanding options (in shares)        
Outstanding shares of common stock equivalents that have been excluded from diluted net loss per common share        
Total common stock equivalents (in shares) 5,995,401 6,322,215 6,065,250 6,134,966
Employee stock purchase plan (in shares)        
Outstanding shares of common stock equivalents that have been excluded from diluted net loss per common share        
Total common stock equivalents (in shares) 27,117 25,481 32,513 31,944
Restricted stock units (in shares)        
Outstanding shares of common stock equivalents that have been excluded from diluted net loss per common share        
Total common stock equivalents (in shares) 445,598 70,000 363,896 59,945