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Warrants (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Mar. 31, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
 [1]
Apr. 30, 2012
Line of Credit Facility [Line Items]              
Warrants issued (in shares)             992,000
Warrants value             $ 5,100
Right to purchase, number of shares per warrant             1
Exercise price of warrants (in dollars per warrant)             $ 10.00
Number of warrants exercised during period     7,790 0      
Gain from settlement of warrants $ 0 $ 0 $ 37 $ 0 $ 37    
Common Stock - Class A | Common Stock - Class A              
Line of Credit Facility [Line Items]              
Issuance of Class A shares of common stock as part of cashless exercise of warrants, shares     1,115     1,115  
[1] During 2014, we issued 1,115 common shares with a par value of $0.01 related to the exercise of warrants, which is not identifiable in this schedule due to rounding.