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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% |  |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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