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Stock Plans and Stock-Based Compensation - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended
Jul. 31, 2021
Mar. 31, 2022
Jul. 31, 2021
Sep. 30, 2019
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
May 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award                
Shares reserved for issuance (in shares)               6,600,000
Weighted-average grant-date fair value of options granted         $ 1.63 $ 3.15    
Options exercised         0 0    
Stock-based compensation expense         $ 1,443,000 $ (286,000)    
Unrecognized stock-based compensation expense   $ 10,900,000     $ 10,900,000      
Unrecognized stock-based compensation expense expected to be recognized, term         1 year 9 months 18 days      
2018 ESPP                
Share-based Compensation Arrangement by Share-based Payment Award                
Number of common stock purchased by employees         0 0    
RSUs                
Share-based Compensation Arrangement by Share-based Payment Award                
Total fair value of awards vested and settled         $ 1,100,000 $ 2,500,000    
Total intrinsic value of awards vested and settled         $ 200,000 $ 600,000    
Granted         730,275      
Forfeited         54,573      
Outstanding awards   1,553,755     1,553,755   970,339  
RSUs | Chief Executive Officer                
Share-based Compensation Arrangement by Share-based Payment Award                
Granted       100,000        
Forfeited 25,000         25,000    
Outstanding awards   50,000     50,000      
Total fair value of awards         $ 400,000      
Stock-based compensation expense         $ 0      
RSUs | Employees Including Executive Officers                
Share-based Compensation Arrangement by Share-based Payment Award                
Granted   255,000 324,214          
Total fair value of awards   $ 400,000 $ 1,200,000          
Stock-based compensation expense     $ 0          
Stock-based compensation arrangement by share-based payment award, requisite service period   1 year 6 months            
Employee Stock Purchase Plan                
Share-based Compensation Arrangement by Share-based Payment Award                
Shares reserved for issuance (in shares)               1,300,000