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SHARE-BASED PAYMENTS - Schedule of Share-based Compensation, Stock Options and Restricted Stock Units Activity (Details) - $ / shares | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2015 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Stock-option |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |
Number of nonvested shares, beginning of period (in shares) |  |  | 365,180 | 227,178 | 177,698
Granted, nonvested, number of shares (in shares) |  |  | 442,956 | 738,893 | 449,537
Vested, number of shares (in shares) |  |  | (448,662) | (486,386) | (331,482)
Nonvested options forfeited, number of shares (in shares) |  |  | (62,430) | (114,505) | (68,575)
Number of nonvested shares, end of period (in shares) | 365,180 | 177,698 | 297,044 | 365,180 | 227,178
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |
Nonvested, weighted average grant date fair value, beginning of period (in dollars per share) |  |  | $ 1.20 | $ 1.48 | $ 3.44
Granted, nonvested, weighted average grant date fair value (in dollars per share) |  |  | 0.96 | 1.18 | 1.29
Vested, weighted average grant date fair value (in dollars per share) |  |  | 1.10 | 1.30 | 2.26
Nonvested options forfeited, weighted average grant date fair value (in dollars per share) |  |  | 0.96 | 1.22 | 1.56
Nonvested, weighted average grant date fair value, end of period (in dollars per share) | $ 1.20 | $ 3.44 | $ 1.06 | $ 1.20 | $ 1.48
RSU |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |
Number of nonvested shares, beginning of period (in shares) |  |  | 1,909,477 | 1,330,469 | 272,866
Granted, nonvested, number of shares (in shares) |  |  | 1,191,132 | 1,390,705 | 1,205,336
Vested, number of shares (in shares) |  |  | (1,486,126) | (752,580) | (138,608)
Nonvested options forfeited, number of shares (in shares) |  |  | (34,296) | (59,118) | (9,125)
Number of nonvested shares, end of period (in shares) | 1,909,477 | 272,866 | 1,580,187 | 1,909,477 | 1,330,469
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |
Nonvested, weighted average grant date fair value, beginning of period (in dollars per share) |  |  | $ 2.17 | $ 2.37 | $ 4.03
Granted, nonvested, weighted average grant date fair value (in dollars per share) |  |  | 1.70 | 2.09 | 2.14
Vested, weighted average grant date fair value (in dollars per share) |  |  | 2.24 | 2.35 | 4.65
Nonvested options forfeited, weighted average grant date fair value (in dollars per share) |  |  | 2.00 | 2.29 | 5.39
Nonvested, weighted average grant date fair value, end of period (in dollars per share) | $ 2.17 | $ 4.03 | $ 1.99 | $ 2.17 | 2.37
Restricted Stock Units (RSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Intrinsic Value | $ 1,490,000 | $ 1,693,303 |  |  | $ 300,000
Number of RSUs granted in period (in shares) |  |  | 1,190,000 | 1,390,000 | 1,210,000

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- Definition The number of grants made 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://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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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. + References No definition available. + Details
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- Definition The grant-date intrinsic value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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