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Balance Sheets and Statements of Operations Components - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Property, Plant and Equipment [Abstract]        
Depreciation and amortization property and equipment $ 1.8 $ 2.2 $ 3.7 $ 4.7