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Notes Payable (Details) - USD ($)
1 Months Ended 3 Months Ended
Nov. 30, 2015
Dec. 31, 2015
Sep. 30, 2015
Aug. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]          
Restricted cash, short-term     $ 7,802,000  
Loan And Security Agreement [Member]          
Debt Instrument [Line Items]          
Carrying value of notes payable     $ 8,425,000 $ 8,300,000  
Restricted cash, short-term       $ 7,800,000  
Loan And Security Agreement [Member] | Subsequent Event [Member]          
Debt Instrument [Line Items]          
Repayments of debt $ 6,600,000        
Prepayment fee (as a percent) 1.00%        
Gain on extinguishment of debt   $ 61,000