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Fair Value Of Warrant Liability (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Balance $ 2,906
Change in fair value (2,374)
Extinguished (357)
Reclassified to equity (175)
Balance $ 0