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
Mar. 31, 2021
Mar. 31, 2020
Class of Stock [Line Items]    
Net proceeds from stock issuance   $ 3,505
Exercise of warrants $ 2,279  
Common Stock and Employee Stock Purchase Plan [Member]    
Class of Stock [Line Items]    
Shares issued in connection with stock option exercise 608,886 111,427
JMP Securities [Member]    
Class of Stock [Line Items]    
Maximum aggregate sales price of shares to be issued under sale agreement $ 50,000  
Net proceeds from stock issuance 2,984  
Common Stock [Member]    
Class of Stock [Line Items]    
Common stock shares issued   1,292,208
Exercise of warrants $ 2,279  
Exercise of warrants issued, shares for cash consideration 167,495  
Aggregate exercise of warrants issued, shares 84,723  
Issued warrants to purchase shares upon exercises 91,833  
Shares issued to outside service provider, shares 15,828  
Common Stock [Member] | JMP Securities [Member]    
Class of Stock [Line Items]    
Common stock shares issued 1,292,208  
Stock issuance costs $ 92