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Revision of Prior Years' Financial Statements (Additional information) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2013
Quantifying Misstatement in Current Year Financial Statements [Line Items]        
Shareholders’ Equity $ 24,021 $ 44,017 $ 50,414 $ 72,519
Retained Earnings (Accumulated Deficit) $ (295,985) $ (273,064)   (240,529)
Scenario, Previously Reported [Member]        
Quantifying Misstatement in Current Year Financial Statements [Line Items]        
Shareholders’ Equity       75,425
Retained Earnings (Accumulated Deficit)       $ (237,623)