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STOCK OPTION PLANS (Tables) | 12 Months Ended
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Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] | We used the following weighted-average assumptions to estimate the fair value of the options granted for the years indicated:
|  | 2018 |  | 2017 |  | 2016
Expected volatility |  | 109% |  | 111% |  | 109%
Expected term |  | 5 years |  | 5 years |  | 5 years
Risk-free interest rate |  | 2.62% |  | 1.81% |  | 1.10%
Expected dividend yield |  | 0.00 |  | 0.00% |  | 0.00%
Equity Incentive Plan 2015 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summarized information of stock options | Summarized information for the 2015 Equity Incentive Plan is as follows:
|  | Options |  |  | Weighted- average exercise price |
Outstanding options at January 1, 2016 |  |  | 1,994,000 |  |  | $ | 6.90 |
Granted, fair value of  $2.59 per share |  |  | 2,622,500 |  |  |  | 3.29 |
Exercised |  |  | (151,000 | ) |  |  | 2.32 |
Expired/forfeited |  |  | (22,500 | ) |  |  | 3.23 |
Outstanding options at December 31, 2016 |  |  | 4,443,000 |  |  | $ | 4.94 |
Granted, fair value of  $11.35 per share |  |  | 1,077,000 |  |  | $ | 14.31 |
Exercised |  |  | (81,719 | ) |  |  | 4.22 |
Expired/forfeited |  |  | (325,314 | ) |  |  | 5.52 |
Outstanding options at December 31, 2017 |  |  | 5,112,967 |  |  | $ | 9.07 |
Granted, fair value of  $10.23 per share |  |  | 1,497,300 |  |  | $ | 12.95 |
Exercised |  |  | (360,853 | ) |  |  | 6.22 |
Expired/forfeited |  |  | (724,009 | ) |  |  | 10.65 |
Outstanding options at December 31, 2018 |  |  | 5,525,405 |  |  | $ | 8.08 |
Non-vested options at December 31, 2016 |  |  | 3,115,313 |  |  | $ | 4.24 |
Non-vested options at December 31, 2017 |  |  | 2,641,832 |  |  |  | 8.21 |
Non-vested options at December 31, 2018 |  |  | 2,355,719 |  |  |  | 10.41 |
Information regarding options outstanding by range of exercise prices | Further information regarding options outstanding under the 2015 Equity Incentive Plan at December 31, 2018 is summarized below:
|  |  |  |  |  |  | Number of |  |  | Weighted-average |  |  | Number of |  |  | Weighted-average |
| Range of exercise prices |  |  | options outstanding |  |  | Remaining life in years |  |  | Exercise price |  |  | options exercisable |  |  | Remaining life in years |  |  | Exercise price |
$ | 2.31 |  |  | $ | 4.45 |  |  |  | 2,252,855 |  |  |  | 6.7 |  |  | $ | 3.51 |  |  |  | 1,593,792 |  |  |  | 6.3 |  |  | $ | 3.42 |
| 5.90 |  |  |  | 9.23 |  |  |  | 1,645,800 |  |  |  | 6.5 |  |  |  | 7.46 |  |  |  | 1,191,561 |  |  |  | 5.4 |  |  |  | 7.25 |
| 11.43 |  |  |  | 14.45 |  |  |  | 591,700 |  |  |  | 9.5 |  |  |  | 13.20 |  |  |  | 50,000 |  |  |  | 9.2 |  |  |  | 13.65 |
| 15.25 |  |  |  | 17.30 |  |  |  | 1,035,050 |  |  |  | 9.0 |  |  |  | 16.09 |  |  |  | 334,333 |  |  |  | 8.9 |  |  |  | 16.04 |
|  |  |  |  |  |  |  |  | 5,525,405 |  |  |  |  |  |  |  |  |  |  |  | 3,169,686 |  |  |  |  |  |  |  |  |
Equity Incentive Plan 2005 [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Summarized information of stock options | Summarized information for the 2005 Equity Incentive Plan is as follows:
|  | Options |  |  | Weighted- average exercise price |
Outstanding options at January 1, 2016 |  |  | 330,084 |  |  | $ | 13.49 |
Expired/forfeited |  |  | (1,524 | ) |  |  | 36.93 |
Outstanding options at December 31, 2016 |  |  | 328,560 |  |  | $ | 14.57 |
Expired/forfeited |  |  | (11,800 | ) |  |  | 21.53 |
Outstanding options at December 31, 2017 |  |  | 316,760 |  |  | $ | 14.31 |
Expired/forfeited |  |  | (360 | ) |  |  | 150.00 |
Outstanding options at December 31, 2018 |  |  | 316,400 |  |  | $ | 14.15 |
Information regarding options outstanding by range of exercise prices | Further information regarding options outstanding under the 2005 Equity Incentive Plan at December 31, 2018 is summarized below:
|  |  |  |  |  |  | Number of |  |  | Weighted-average |  |  | Number of |  |  | Weighted-average |
| Range of exercise prices |  |  | options outstanding |  |  | Remaining life in years |  |  | Exercise price |  |  | options exercisable |  |  | Remaining life in years |  |  | Exercise price |
$ | 3.25 |  |  | $ | 3.25 |  |  |  | 120,000 |  |  |  | 1.1 |  |  | $ | 3.25 |  |  |  | 120,000 |  |  |  | 1.1 |  |  | $ | 3.25 |
| 11.50 |  |  |  | 18.50 |  |  |  | 189,000 |  |  |  | 3.9 |  |  |  | 18.35 |  |  |  | 189,000 |  |  |  | 3.9 |  |  |  | 18.35 |
| 30.50 |  |  |  | 122.50 |  |  |  | 7,400 |  |  |  | 2.1 |  |  |  | 83.72 |  |  |  | 7,400 |  |  |  | 2.1 |  |  |  | 83.72 |
|  |  |  |  |  |  |  |  | 316,400 |  |  |  |  |  |  |  |  |  |  |  | 316,400 |  |  |  |  |  |  |  |  |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + 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 (d) -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 (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: 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) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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