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Leases - Schedule of Future Minimum Lease Payments under Non-cancelable Operating and Capital Leases (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Operating leases
2019	$ 3,175
2020	3,270
2021	3,369
2022	3,470
2023	3,574
Thereafter	18,067
Total future minimum lease payments	34,925
Capital leases
2019	287
2020	214
2021	2
Total future minimum lease payments	503
Less amounts representing interest	27
Capital lease obligations at December 31, 2018	476
Less current portion of capital lease obligations	266	$ 425
Capital lease obligations, net of current portion	$ 210	$ 466

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Amount of capital lease obligation due within one year or the normal operating cycle, if longer.

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Amount of minimum lease payments for capital leases due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount necessary to reduce net minimum lease payments to present value for capital leases.

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