Summary of Significant Accounting Policies - Additional Information (Details)	3 Months Ended
	Mar. 31, 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