Summary of Future Minimum Lease Payments Under Non-Cancelable Operating Leases Recognized Under Topic 842 (Detail) $ in Thousands	Sep. 30, 2019 USD ($)
Maturity of lease liability
2019 (October - December)	$ 2,809
2020	11,718
2021	12,890
2022	11,080
2023	11,230
Thereafter	21,126
Total minimum lease payments	70,853
Less: imputed interest	(13,516)
Total operating lease liabilities	57,337
Included in the condensed consolidated balance sheet:
Current portion of lease liabilities within other current liabilities	$ 7,596
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesCurrent
Lease liabilities	$ 49,741
Total operating lease liabilities	$ 57,337