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Equity Incentive Plans and Stock-Based Compensation (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 24, 2014
shares
Apr. 30, 2009
shares
Sep. 30, 2017
Jun. 30, 2012
shares
Dec. 31, 2017
numerator
denominator
shares
Dec. 31, 2015
shares
Apr. 23, 2015
shares
Mar. 31, 2006
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Tenure of award (in years)         10 years      
Numerator in conversion factor used to determine shares available for grant | numerator         1.5      
Denominator in conversion factor used to determine shares available for grant | denominator         1      
Option One                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Requisite service period (in months)         60 months      
Option Two                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Requisite service period (in months)         48 months      
Stock Compensation Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares reserved for issuance under the stock option plan         35,400,000   4,000,000 8,400,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 10,000,000 6,500,000   6,500,000   4,000,000    
Restricted Stock and Stock Units [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Requisite service period (in months)     2 years 4 months 24 days   4 years      
Director [Member] | Restricted Stock and Stock Units [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Requisite service period (in months)         1 year