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STOCK OPTION PLANS (Details 1) - $ / shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
2015 Equity Incentive Plan [Member] |  |  |
Options [Roll Forward] |  |  |
Outstanding options, beginning balance (in shares) | 5,112,967 | 4,443,000 | 1,994,000
Granted (in shares) | 1,497,300 | 1,077,000 | 2,622,500
Exercised (in shares) | (360,853) | (81,719) | (151,000)
Expired/forfeited (in shares) | (724,009) | (325,314) | (22,500)
Outstanding options, ending balance (in shares) | 5,525,405 | 5,112,967 | 4,443,000
Non-vested options, ending balance (in shares) | 2,355,719 | 2,641,832 | 3,115,313
Weighted-average exercise price [Roll Forward] |  |  |
Outstanding options, beginning of period (in dollars per share) | $ 9.07 | $ 4.94 | $ 6.90
Granted (in dollars per share) | 12.95 | 14.31 | 3.29
Exercised (in dollars per share) | 6.22 | 4.22 | 2.32
Expired/forfeited (in dollars per share) | 10.65 | 5.52 | 3.23
Outstanding options, ending balance (in dollars per share) | 8.08 | 9.07 | 4.94
Non-vested option, send on period (in dollars per share) | $ 10.41 | $ 8.21 | $ 4.24
2005 Equity Incentive Plan [Member] |  |  |
Options [Roll Forward] |  |  |
Outstanding options, beginning balance (in shares) | 316,760 | 328,560 | 330,084
Expired/forfeited (in shares) | (360) | (11,800) | (1,524)
Outstanding options, ending balance (in shares) | 316,400 | 316,760 | 328,560
Weighted-average exercise price [Roll Forward] |  |  |
Outstanding options, beginning of period (in dollars per share) | $ 14.31 | $ 14.57 | $ 13.49
Expired/forfeited (in dollars per share) | 150.00 | 21.53 | 36.93
Outstanding options, ending balance (in dollars per share) | $ 14.15 | $ 14.31 | $ 14.57

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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=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + 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)-(4) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + 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=109197908&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=109197908&loc=d3e5070-113901 + Details
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