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Balance Sheets and Statements of Operations Components - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Property, Plant and Equipment [Abstract]        
Depreciation and amortization property and equipment $ 2.1 $ 2.6 $ 6.7 $ 7.2