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Commitments and Contingencies - Future Minimum Lease Commitments under Operating and Capital Leases (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Commitments And Contingencies Disclosure [Abstract]
Capital Leases, 2017	$ 74
Capital Leases, 2018	24
Capital Leases, 2019	5
Capital Leases, 2020	0
Capital Leases, 2021 and thereafter	0
Total minimum lease payments under capital leases	103
Less: amounts representing interest of capital leases	(9)
Capital Leases, Present value of minimum lease payments	94
Less: current portion of obligations under capital leases	(68)	$ (71)
Long-term portion of obligations under capital leases	26
Operating leases, 2017	2,133
Operating leases, 2018	2,092
Operating leases, 2019	2,082
Operating leases, 2020	2,041
Operating leases, 2021 and thereafter	1
Total minimum lease payments under operating leases	$ 8,349

X

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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 equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date.

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Amount of minimum lease payments for capital leases due in the next 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 of minimum lease payments for capital leases due in the fourth 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 of minimum lease payments for capital leases due in the second 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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Present value of minimum lease payments for capital leases net of executory costs, including amounts paid by the lessee to the lessor for insurance, maintenance and taxes.

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