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Fair Value Of Warrant Liability (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Balance $ 2,906 $ 0
Issuance   4,619
Change in fair value (2,374) (1,713)
Extinguished (357)  
Reclassified to equity (175)  
Balance $ 0 $ 2,906