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Summary of Significant Accounting Policies (Anti-dilutive Shares Excluded from Computation of Diluted Net Income (Loss) per Share) (Details) - shares
shares in Thousands
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Stock Options [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from the computation of earnings per share 19,921 23,048
Time-Based Restricted Stock Units (RSUs) [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from the computation of earnings per share 5,971 1,094
Performance-Based Restricted Stock Units (RSUs) [Member]    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from the computation of earnings per share 94 138