Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Deficit) - Additional Information (Detail)

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Stockholders' Equity (Deficit) - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Class Of Stock [Line Items]      
Net proceeds from stock issuance     $ 6,527
Exercise of warrants $ 2,100 $ 2,279 2,100
JMP Securities [Member]      
Class Of Stock [Line Items]      
Net proceeds from stock issuance     $ 6,006
Common Stock      
Class Of Stock [Line Items]      
Shares issued to outside service provider, shares   15,828  
Common stock shares issued 199,109   1,491,317
Exercise of warrants   $ 2,279 $ 2,100
Exercise of warrants issued, shares for cash consideration   167,495 154,311
Aggregate exercise of warrants issued, shares   84,723  
Issued warrants to purchase shares upon exercises   91,833  
Common Stock | JMP Securities [Member]      
Class Of Stock [Line Items]      
Common stock shares issued     1,491,317
Stock issuance costs     $ 270
Common Stock and Employee Stock Purchase Plan [Member]      
Class Of Stock [Line Items]      
Shares issued in connection with stock option exercise   803,367 199,942