Summary of Future Minimum Lease Payments Under Non-Cancelable Operating Leases Recognized Under Topic 842 (Detail) $ in Thousands	Jun. 30, 2019 USD ($)
Maturity of lease liability
2019 (July - December)	$ 5,467
2020	11,395
2021	12,558
2022	10,737
2023	10,877
Thereafter	20,484
Total minimum lease payments	71,518
Less: imputed interest	(14,148)
Total operating lease liabilities	57,370
Included in the condensed consolidated balance sheet:
Current portion of lease liabilities within other current liabilities	$ 7,161
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesCurrent
Lease liabilities	$ 50,209
Total operating lease liabilities	$ 57,370