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STOCKHOLDERS' EQUITY - Stock-based Compensation (Details) | 12 Months Ended
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Dec. 31, 2020 plan shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of share-based compensation plans | plan | 1
Stock Options |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting period | 3 years
Performance Shares | Employee |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting period | 3 years
2017 Plan |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares authorized for grants (in shares) | 1,600,000
Expiration period of options granted | 10 years
2017 Plan | Non-employee Director |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Shares purchased under restricted stock purchase agreements, minimum (in shares) | 70
Shares purchased under restricted stock purchase agreements, maximum (in shares) | 54,000
2017 Plan | Stock Options |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Shares available for future awards (in shares) | 873,256
1999 Stock Plan |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Number of shares authorized for grants (in shares) | 6,000,000

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of shares authorized for issuance under share-based payment arrangement. + 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 (a)(3) -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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