XML 142 R47.htm IDEA: XBRL DOCUMENT v3.24.1.u1
Stockholders' Equity - Stock Options and Employee Stock Purchase Plan - Additional Information (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Aug. 28, 2023
Feb. 22, 2022
Oct. 07, 2021
Mar. 08, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Oct. 31, 2023
Class Of Stock [Line Items]                      
Voluntarily forfeited outstanding stock options             593,384        
Expired, Options Outstanding             333,631        
Stock-based compensation         $ 157,000 $ 544,000 $ 1,307,000 $ 1,877,000 $ 2,377,000 $ 2,256,000  
Revenue recognized   $ 1,500,000     $ 5,000 $ 131,000 $ 80,000 $ 208,000 $ 370,000 $ 1,500,000  
Vesting criteria probability of achievement percentage                 0.00%    
Expense recorded                 $ 0    
Weighted-average remaining contractual term of stock options exercisable             7 years 4 months 9 days   8 years    
Weighted-average remaining contractual term of stock options outstanding                 8 years    
Issuance of common stock from stock options exercises, net, Shares                 0 0  
Number of common stock shares approved under ESPP         2,509,149   2,509,149   2,709,831    
Expected life of options         6 years 6 years 6 years 6 years 6 years 5 years 9 months  
Number of stock options vested                 0    
Executive Chairman [Member]                      
Class Of Stock [Line Items]                      
Voluntarily forfeited outstanding stock options 462,500                    
Unvested, cancelled shares 312,918                    
Expired, Options Outstanding 149,582                    
Executive Chairman [Member] | Selling, General and Administrative Expenses [Member]                      
Class Of Stock [Line Items]                      
Stock-based compensation $ 519,000                    
Aforementioned Officer One [Member]                      
Class Of Stock [Line Items]                      
Stock options granted     120,000                
Aforementioned Officer Two [Member]                      
Class Of Stock [Line Items]                      
Stock options granted     25,000                
Equity Incentive Plan 2022 [Member]                      
Class Of Stock [Line Items]                      
Stock options granted         40,000   171,257   255,474    
Number of common stock shares approved under ESPP         1,643,798   1,643,798   1,071,471    
2012 Plan [Member]                      
Class Of Stock [Line Items]                      
Stock options granted                 255,474    
2012 Plan [Member] | Executive Chairman [Member]                      
Class Of Stock [Line Items]                      
Stock options granted     60,000 120,000              
2012 Plan [Member] | Chief Scientific Officer [Member]                      
Class Of Stock [Line Items]                      
Stock options granted     15,000 25,000              
2016 Employee Stock Purchase Plan [Member]                      
Class Of Stock [Line Items]                      
Number of common stock shares approved under ESPP         75,000   75,000   75,000    
Employee subscription rate                 15.00%    
Compensation amount per employee                 $ 25,000    
Fair market value at discount                 85.00%    
Purchase period                 6 months    
Initial offering period                 2016-09    
Description of plan                 Shares under the ESPP are purchased at 85 percent of the fair market value at the lower of (i) the closing price on the first trading day of the six-month purchase period or (ii) the closing price on the last trading day of the six-month purchase period.    
Shares issued under ESPP                 1,009    
Shares remaining available for purchase under ESPP                 58,426    
2023 Employee Stock Purchase Plan [Member]                      
Class Of Stock [Line Items]                      
Number of common stock shares approved under ESPP                     45,000
Employee subscription rate         15.00%   15.00%        
Compensation amount per employee             $ 25,000,000        
Number of shares per employee             500        
Fair market value at discount             85.00%        
Purchase period             6 months        
Initial offering period             2024-03        
Description of plan             Shares under the 2023 ESPP are purchased at 85 percent of the fair market value at the lower of (i) the closing price on the first trading day of the six-month purchase period or (ii) the closing price on the last trading day of the six-month purchase period.