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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Number of penny warrants issuable (in shares) 250,000  
Sublease exit liabilities   $ 2.5
Minimum    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Leases weighted average discount rate 12.00%  
Maximum    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Leases weighted average discount rate 15.00%