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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
6 Months Ended
Jun. 30, 2020
Jun. 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 20,485 23,414
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 5,109 1,121
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 138 138