Quarterly report pursuant to Section 13 or 15(d)

Description of Business and Basis of Presentation - Additional Information (Detail)

v3.21.2
Description of Business and Basis of Presentation - Additional Information (Detail) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Feb. 10, 2021
Dec. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2019
Basis Of Presentation [Line Items]          
Series F Preferred stock, shares issued   1 0    
Gross proceeds from the issuance of common stock, net of offering costs $ 14,400        
Gross proceeds from warrant exercises   $ 1,500 $ 16,560 $ 46  
Cash, cash equivalents, and restricted cash   17,876 33,589 $ 19,159 $ 6,101
Accounts receivable, net   3,059 3,637    
Equity raise of gross proceeds $ 14,400        
Amount received for Employee Retention Credit     1,800    
SWK Loan          
Basis Of Presentation [Line Items]          
Working capital   23,900 39,200    
Pacific Mercantile Bank | Loan Agreement          
Basis Of Presentation [Line Items]          
Unused availability   $ 2,300 $ 2,800