Annual report pursuant to Section 13 and 15(d)

Future Minimum Rental Commitments Under Lease Agreements (Detail)

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Future Minimum Rental Commitments Under Lease Agreements (Detail)
$ in Thousands
Dec. 31, 2018
USD ($)
Commitments And Contingencies Disclosure [Abstract]  
2019 $ 802
2020 313
2021 33
Total future minimum lease obligations $ 1,148