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Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - ASU 2016-02 - USD ($)
$ in Millions
Jan. 01, 2019
Mar. 31, 2019
New Accounting Pronouncements    
Package of practical expedients true  
Lessee, Operating Lease, Discount Rate   7.49%
Incremental borrowing rate   7.49%
Restatement Adjustment    
New Accounting Pronouncements    
Lease liability $ 1.9  
Right-of-use asset $ 1.9