STOCK-BASED COMPENSATION - Employee Stock Purchase Plan (Details) - Purchase Plan |
12 Months Ended | |||
|---|---|---|---|---|
|
Dec. 31, 2020
USD ($)
$ / shares
shares
|
Dec. 31, 2019
$ / shares
shares
|
Dec. 31, 2018
$ / shares
shares
|
Jul. 01, 2020
USD ($)
|
|
| Stock Based Compensation | ||||
| Purchase price expressed as a percentage of fair market value of common stock on the first day of the offering period | 85.00% | |||
| Purchase price expressed as a percentage of fair market value of common stock on the purchase date | 85.00% | |||
| Number of shares of common stock issued | shares | 567,391 | 747,691 | 783,984 | |
| Average price of shares issued (in dollars per share) | $ / shares | 1.54 | 1.92 | 1.92 | |
| Weighted average fair value of stock purchased (in dollars per share) | $ / shares | $ 0.87 | $ 1.07 | $ 1.27 | |
| Number of shares of common stock available for future issuance | shares | 16,502 | |||
| Award offering period | 24 months | |||
| Total incremental fair value for the Purchase Plan reset | $ | $ 753,000 | $ 535,000 | ||
| X | ||||||||||
- Definition Represents the incremental fair value for awards under the Purchase Plan reset feature. No definition available.
|
| X | ||||||||||
- Definition Represents the offering period for awards under the equity-based compensation plan. No definition available.
|
| X | ||||||||||
- Definition Represents the average purchase price for equity-based awards issued during the period on other than stock (or unit) option plans (Employee Stock Purchase Plan). No definition available.
|
| X | ||||||||||
- Definition Represents the purchase price expressed as a percentage of the fair market value of common stock on the first day of the offering period. No definition available.
|
| X | ||||||||||
- 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). Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- 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.
|
| X | ||||||||||
- Definition Number of shares authorized for issuance under share-based payment arrangement. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Purchase price of common stock expressed as a percentage of its fair value. No definition available.
|
| X | ||||||||||
- Definition Number of shares issued during the period as a result of an employee stock purchase plan. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Details
|