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Other Assets - Summary of Other Assets (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Bonds and escrow deposits $ 628 $ 380
Prepaid insurance 496 486
Other 289 419
Other assets, gross 1,413 1,285
Other Assets, accumulated amortization (155) (669)
Other assets $ 1,258 $ 616