Annual report pursuant to Section 13 and 15(d)

Financial Instruments - Reconciliation of Level 3 Measurement of Company's April 2018 Warrant (Detail)

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Financial Instruments - Reconciliation of Level 3 Measurement of Company's April 2018 Warrant (Detail) - April 2018 Warrant [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning, Balance $ 23  
Issuance of warrant   $ 207
Change in fair value (16) (184)
Ending, Balance $ 7 $ 23