Annual report pursuant to Section 13 and 15(d)

Income Taxes - Additional Information (Details)

v3.3.1.900
Income Taxes - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating Loss Carryforwards [Line Items]      
Federal statutory income tax rate 34.00% 34.00% 34.00%
Increase (decrease) in the valuation allowance $ 19,600,000 $ 29,900,000 $ (73,900,000)
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 8,000,000    
Unrecognized tax benefits, income tax penalties or interest charged 0    
Stock Option [Member]      
Operating Loss Carryforwards [Line Items]      
Net Operating Loss Carry-forwards 5,200,000    
State [Member]      
Operating Loss Carryforwards [Line Items]      
Net Operating Loss Carry-forwards 202,700,000    
California [Member]      
Operating Loss Carryforwards [Line Items]      
Net operating loss carry-forward expired 22,400,000 54,300,000 16,800,000
Federal [Member]      
Operating Loss Carryforwards [Line Items]      
Net Operating Loss Carry-forwards 311,500,000    
Net operating loss carry-forward expired $ 0 $ 0 $ 0