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Rollforward of Fair Value of Derivative Liabilities (Detail) - Derivative Liabilities
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Beginning balance $ 51
Increase in fair value of warrants upon re-measurement 1
Amortization of conversion rights (40)
Fair value of warrants issued with 2019 Note 871
Ending balance $ 883