Leases - Summary of Lease Cost (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Total lease cost	$ 2,548
Short-term lease cost	821
Cost of revenue
Lessee, Lease, Description [Line Items]
Total lease cost	1,693
G&A expenses
Lessee, Lease, Description [Line Items]
Total lease cost	$ 855