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Summary of Significant Accounting Policies - Additional Information (Details)
 6 Months Ended
Jun. 30, 2019
Lessee, Lease, Description [Line Items]  
Optional extension or renewal term (up to) 5 years
Optional termination period 1 year
Minimum  
Lessee, Lease, Description [Line Items]  
Initial lease terms 1 year
Maximum  
Lessee, Lease, Description [Line Items]  
Initial lease terms 8 years