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Prepaid Expenses and Other Current Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Prepaid insurance	$ 502	$ 437
Prepaid research and development	122	508
Other prepaid	597	321
Other current assets	388	298
Total	$ 1,609	$ 1,564

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Amount of current assets classified as other.

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