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Warrants - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Class Of Warrant Or Right [Line Items]        
Purchase of common stock warrants exercised 24,000 445,000 94,000 468,000
Proceeds from exercise of warrants   $ 500 $ 105 $ 524
Exercise of warrants 40,000   96,000  
Shares issued 15,000   40,000  
Maximum [Member]        
Class Of Warrant Or Right [Line Items]        
Proceeds from exercise of warrants $ 100