Annual report pursuant to Section 13 and 15(d)

Summary of Income Tax Current and Deferred Provision (Detail)

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Summary of Income Tax Current and Deferred Provision (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current:      
State $ 19 $ 22 $ 30
Foreign 93 69 87
Total current income tax provision 112 91 117
Deferred:      
Federal (694) 60 61
Total deferred income tax provision (694) 60 61
Total income tax provision $ (582) $ 151 $ 178