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Prepaid Expenses and Other Current Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Prepaid Expenses And Other Current Assets [Line Items]    
Equipment maintenance and services $ 1,091 $ 586
Prepaid taxes 311 626
Prepaid insurance 594 356
Deferred costs 67 5
Other 218 71
Total $ 2,281 $ 1,644