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Summary of Outstanding Warrants Issued by Company (Detail) - East West Bank Warrant - $ / shares
3 Months Ended
Mar. 31, 2020
Feb. 08, 2017
Class Of Warrant Or Right [Line Items]    
Number of Shares Issuable Upon Exercise 40,000  
Weighted Average Exercise Price $ 3.64 $ 3.64
Issue Date Feb. 08, 2017  
Expiration Date Feb. 08, 2022