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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Millions
 1 Months Ended
Jul. 31, 2015
Jan. 31, 2015
Feb. 28, 2014
Dec. 31, 2016
Dec. 31, 2015
Class of Stock [Line Items]          
Common stock, shares authorized (in shares)       125,000,000 125,000,000
Common stock, par value (in dollars per share)       $ 0.01 $ 0.01
Number of shares issued or sold (in shares) 3,525,000   1,800,000    
Price per share (in dollars per share) $ 37.00   $ 36.50    
Additional shares sold under over-allotments option to underwriter (in shares) 528,750   450,000    
Proceeds from sale of shares $ 141.0   $ 76.7    
Johnson & Johnson Innovation JJDC, Inc,          
Class of Stock [Line Items]          
Sale of common stock (in shares)   1,923,077      
Sale of common stock (in dollars per share)   $ 39      
Proceeds of stock sale   $ 75.0      
Undesignated Preferred Stock          
Class of Stock [Line Items]          
Undesignated preferred stock, shares authorized (in shares)       5,000,000  
Undesignated preferred stock, par value (in dollars per share)       $ 0.01  
Undesignated preferred stock, shares issued (in shares)       0 0
Undesignated preferred stock, shares outstanding (in shares)       0 0