Annual report pursuant to Section 13 and 15(d)

Capital Stock - Registered Direct Offerings - Additional Information (Details)

v3.6.0.2
Capital Stock - Registered Direct Offerings - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
Dec. 08, 2014
Dec. 31, 2016
Feb. 29, 2016
Dec. 31, 2015
Class Of Warrant Or Right [Line Items]        
Offering price (in dollars per share) $ 98.80      
Warrant outstanding (in shares)   498,556   908,298
Exercise price of warrants (in dollars per share)     $ 15.40  
Underwritten Offering [Member]        
Class Of Warrant Or Right [Line Items]        
Common stock per capital unit (in shares) 1      
Gross proceeds from issuance of capital units $ 40.0      
Offering expense $ 2.3      
Immediate term for warrants exercisable (in years) 2 years      
Warrant outstanding (in shares) 404,858      
Exercise price of warrants (in dollars per share) $ 158.01