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EMPLOYEE BENEFIT PLANS - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Granted (in shares) | 0 | 0 | 0
Weighted-average remaining contractual term (in years) | 1 year 2 months 12 days |  |
Aggregate intrinsic value | $ 3,300,000 |  |
Intrinsic value of options exercised | 2,100,000 | $ 200,000 | $ 1,800,000
Fair value of options vested | 0 | 0 | 100,000
Payments of dividends | 0 | 0 | 0
RSUs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Fair value | 18,300,000 | $ 15,500,000 | 9,700,000
Unrecognized share-based compensation cost | $ 18,300,000 |  |
Weighted-average period (in years) | 1 year 6 months |  |
Weighted average fair value (in dollars per share) | $ 7.90 |  |
Stock options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average exercise price (in dollars per share) | $ 3.15 | $ 5.80 |
Income tax benefit from stock option exercises | $ 0 | $ 0 | $ 0
Employee stock purchase rights under ESPP |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share exercise price (in percent) | 85.00% |  |
Common stock reserved for issuance (in shares) | 1,184,205 |  |
Employees payroll deductions minimum (in percent) | 1.00% |  |
Employees payroll deductions maximum (in percent) | 10.00% |  |
Common stock issued under the 2002 ESPP (in shares) | 1,024,244 | 1,036,543 | 1,037,366
Stock contributions value under 2002 ESPP | $ 5,100,000 | $ 4,500,000 | $ 4,100,000
Discount on the purchase of the stock (in percent) | 15.00% |  |
Fair value of the put option (in percent) | 15.00% |  |
Weighted average fair value (in dollars per share) | $ 2.24 | $ 1.80 | $ 1.33
1995 Stock Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share exercise price (in percent) | 100.00% |  |
Expiration period (in years) | 7 years |  |
Common stock reserved for issuance (in shares) | 7,317,622 |  |
Shares available for grant (in shares) | 3,223,471 |  |
1995 Stock Plan | Incentive Stock Option or Non-statutory Stock Option with Exercise Price less than 100% Fair Value of Common Stock on Grant Date |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Granted (in shares) | 0 |  |
1995 Stock Plan | RSUs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average exercise price (in dollars per share) | $ 0 |  |
1995 Stock Plan | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period (in years) | 2 years |  |
1995 Stock Plan | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period (in years) | 4 years |  |
2002 Director Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share exercise price (in percent) | 100.00% |  |
Common stock reserved for issuance (in shares) | 800,182 |  |
Shares available for grant (in shares) | 628,749 |  |
2002 Director Plan | RSUs |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted average exercise price (in dollars per share) | $ 0 |  |
Vesting period (in years) | 1 year |  |
2002 Director Plan | Stock options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period (in years) | 3 years |  |
Expiration period (in years) | 7 years |  |
TVN |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Employer contributions made | $ 0 |  |
Expected employer contributions in 2022 | $ 0 |  |

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- Definition Amount of contribution expected to be received by defined benefit plan from employer in next fiscal year following current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 + 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 Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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