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Net (Loss) Income per Share Attributable to Common Stock - Stock Options and Restricted Stock (Details) - Weighted Average - shares
3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2015
Sep. 30, 2014
Sep. 30, 2013
Anti-dilutive Securities Excluded from Calculation of Earnings Per Share        
Weighted average number of securities excluded from calculation 226,839 286,157 195,480  
Stock options        
Anti-dilutive Securities Excluded from Calculation of Earnings Per Share        
Weighted average number of securities excluded from calculation 160,434 159,561 162,107 0
Restricted Stock Units        
Anti-dilutive Securities Excluded from Calculation of Earnings Per Share        
Weighted average number of securities excluded from calculation 66,405 126,596 33,373 0