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SHARE-BASED PAYMENTS - Schedule of Share-based Compensation, Stock Options, Activity (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] |  |  |
Weighted average exercise price, beginning of period (in dollars per share) | $ 3.43 | $ 3.84 | $ 4.48
Grants in period, weighted average exercise price (in dollars per share) | 1.77 | 2.92 | 1.75
Exercises in period, weighted average exercise price (in dollars per share) | 1.97 | 2.27 | 2.15
Forfeitures in period, weighted average exercise price (in dollars per share) | 3.26 | 3.94 | 3.96
Expirations in period, weighted average exercise price (in dollars per share) | 4.40 | 6.97 | 8.18
Weighted average exercise price, end of period (in dollars per share) | $ 2.91 | $ 3.43 | $ 3.84
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Number of options, beginning of period (in shares) | 1,487,433 | 1,732,754 | 2,028,847
Stock options granted in period (in shares) | 711,414 | 296,450 | 442,956
Number of exercises in period (in shares) | (302,707) | (54,805) | (355,092)
Number of forfeitures in period (in shares) | (188,541) | (342,866) | (213,393)
Number of expirations in period (in shares) | (98,512) | (144,100) | (170,564)
Number of options, end of period (in shares) | 1,609,087 | 1,487,433 | 1,732,754
Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] |  |  |
Weighted average exercise price, beginning of period (in dollars per share) | $ 1.70 | $ 1.70 | $ 1.77
Grants in period, weighted average exercise price (in dollars per share) | 1.76 |  | 1.70
Exercises in period, weighted average exercise price (in dollars per share) |  | 1.70 | 1.70
Forfeitures in period, weighted average exercise price (in dollars per share) | 1.70 | 1.70 | 1.70
Expirations in period, weighted average exercise price (in dollars per share) | 4.12 |  | 5.86
Weighted average exercise price, end of period (in dollars per share) | 1.70 | 1.70 | 1.70
Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] |  |  |
Weighted average exercise price, beginning of period (in dollars per share) | 15.61 | 15.61 | 15.61
Grants in period, weighted average exercise price (in dollars per share) | 3.06 |  | 2.88
Exercises in period, weighted average exercise price (in dollars per share) |  | 2.92 | 2.55
Forfeitures in period, weighted average exercise price (in dollars per share) | 5.18 | 7.42 | 6.63
Expirations in period, weighted average exercise price (in dollars per share) | 5.22 |  | 10.36
Weighted average exercise price, end of period (in dollars per share) | $ 15.61 | $ 15.61 | $ 15.61

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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + 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)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Number of options outstanding, including both vested and non-vested 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 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option 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)(1)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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