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Financial Instruments - Reconciliation of Level 3 Measurement of Company's April 2018 Warrant (Detail) - April 2018 Warrant [Member]
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]  
Beginning, Balance $ 23
Change in fair value 13
Ending, Balance $ 36