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Term Loan - Additional Information (Detail) - Silicon Valley Bank [Member] - Term Loans [Member]
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended
Aug. 31, 2018
Tranches
Mar. 31, 2020
USD ($)
$ / shares
shares
Mar. 31, 2019
USD ($)
Dec. 18, 2019
USD ($)
Debt Instrument [Line Items]        
Number of tranches | Tranches 3      
Loan agreement, description   Contemporaneously with executing the Loan Agreement, the Company drew down the first $5.0 million tranche.    
Loan agreement, frequency of payments   monthly    
Interest expense     $ 0.1  
Tranche One [Member]        
Debt Instrument [Line Items]        
Aggregate principal amount of loans       $ 5.0
Amount borrowed   $ 5.0    
Warrants to Purchase Common Stock [Member]        
Debt Instrument [Line Items]        
Warrants issued in connection with loan | shares   1,839    
Excercise price of warrants or rights | $ / shares   $ 74.80    
Warrant expiration date Aug. 21, 2028