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Summary of Significant Accounting Policies (Anti-Dilutive Shares Excluded from Computation of Diluted Net Loss per Share) (Details) - shares
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Stock Options [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive shares outstanding excluded from computation 23,833 28,879
RSUs with Time-Based Vesting [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive shares outstanding excluded from computation 1,102 355
RSUs with Performance-Based Vesting [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Anti-dilutive shares outstanding excluded from computation 138 652