STOCK-BASED COMPENSATION - Employee Stock Option Plans (Details) |
12 Months Ended |
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Dec. 31, 2018
plan
shares
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| STOCK-BASED COMPENSATION | |
| Number of stock option plans | plan | 2 |
| Number of shares of common stock authorized (in shares) | 20,713,331 |
| Employee stock option | |
| STOCK-BASED COMPENSATION | |
| Expiration period | 10 years |
| Options exercised during the period (in shares) | 1,172,615 |
| 2018 Equity Incentive Plan | Employee stock option | |
| STOCK-BASED COMPENSATION | |
| Expiration period | 10 years |
| Number of shares of common stock authorized (in shares) | 34,174,470 |
| Inducement Plan | Employee stock option | |
| STOCK-BASED COMPENSATION | |
| Number of shares of common stock authorized (in shares) | 1,635,875 |
| Inducement Plan | Employee stock option | Maximum | |
| STOCK-BASED COMPENSATION | |
| Expiration period | 10 years |
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- Definition Represents the number of stock option plans under the share-based compensation arrangements. No definition available.
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- Definition Aggregate number of common shares reserved for future issuance. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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. No definition available.
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Number of share options (or share units) exercised during the current period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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