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EQUITY INCENTIVE PLANS - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended
Mar. 31, 2015
Mar. 31, 2022
Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Term for stock options to be granted 10 years    
Price of stock option as percentage of estimated fair value of shares on date of grant 100.00%    
Voting power threshold 10.00%    
Weighted-average grant date fair value of employee stock options granted (in dollars per share)   $ 0.53 $ 1.51
Unrecognized share-based compensation expense, options   $ 4.1  
ESPP      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Automatic annual increase in shares authorized for issuance in equity incentive plan 1.00%    
Price of stock option as percentage of estimated fair value of shares on date of grant 85.00%    
Limit on employee's payroll deductions as a percentage of eligible compensation   15.00%  
Issuance of common stock under Employee Stock Purchase Plan (in shares)   0 0
Estimated unrecognized share-based compensation expense   $ 0.4  
Weighted-average period to recognize unrecognized compensation cost   7 months 6 days  
Restricted Stock Units and Performance-based Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
RSUs and PRSUs granted (in dollars per share)   $ 0.83 $ 2.56
Fair value of RSUs and PRSUs   $ 1.0 $ 0.3
Estimated unrecognized share-based compensation expense   $ 2.7  
Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average period to recognize unrecognized compensation cost   2 years 6 months  
More than 10% of voting power      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Price of stock option as percentage of estimated fair value of shares on date of grant 110.00%    
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 4 years    
Maximum | ESPP      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Automatic increase in number of shares available for issuance (in shares) 490,336    
2015 EIP      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Automatic annual increase in shares authorized for issuance in equity incentive plan 4.00%