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EQUITY INCENTIVE PLANS - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2015 | Dec. 31, 2023 | Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted-average grant date fair value of employee stock options granted (USD per share) |  | $ 0.72 | $ 0.51
Unrecognized share-based compensation expense, options |  | $ 2.4 |
Restricted Stock Units and Performance-based Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted-average period to recognize unrecognized compensation cost (in years) |  | 2 years |
RSUs and PRSUs granted (USD per share) |  | $ 1.00 | $ 0.83
Fair value of RSUs and PRSUs |  | $ 0.7 | $ 1.6
Estimated unrecognized share-based compensation expense (in years) |  | $ 1.7 |
Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted-average period to recognize unrecognized compensation cost (in years) |  | 1 year 10 months 24 days |
2015 EIP and 2020 IIP |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Automatic annual increase in shares authorized for issuance in equity incentive plan (as a percent) | 4.00% |  |
Term for stock options to be granted (in years) | 10 years |  |
Price of stock option as percentage of estimated fair value of shares on date of grant (as a percent) | 100.00% |  |
Voting power threshold (as a percent) | 10.00% |  |
2015 EIP and 2020 IIP | 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 (as a percent) | 110.00% |  |
2015 EIP and 2020 IIP | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period (in years) | 3 years |  |
2015 EIP and 2020 IIP | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period (in years) | 4 years |  |
2015 ESPP | ESPP |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Automatic annual increase in shares authorized for issuance in equity incentive plan (as a percent) | 1.00% |  |
Price of stock option as percentage of estimated fair value of shares on date of grant (as a percent) | 85.00% |  |
Employee payroll deduction under the stock plan (as a percent) | 15.00% |  |
Issuance of common stock under Employee Stock Purchase Plan (in shares) |  | 309,548 | 363,596
Weighted-average period to recognize unrecognized compensation cost (in years) |  | 4 months 24 days |
2015 ESPP | Maximum | ESPP |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Common stock shares outstanding (in shares) | 490,336 |  |

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