STOCK OPTION PLANS (Tables)
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12 Months Ended |
Dec. 31, 2017 |
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| Equity Incentive Plan 2015 [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Summarized information of stock options |
Summarized information for the 2015 Equity Incentive Plan is as follows: | | | | | Weighted- | | | | | | | average | | | | | | | exercise | | | | | Options | | 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 | | | | | | | | | | | | Exercisable at December 31, 2017 | | | 2,471,135 | | | 5.48 | | | Options vested during the twelve months ended December 31, 2017 | | | 1,143,448 | | | 4.19 | | | | | | | | | | | | Non-vested options at December 31, 2016 | | | 3,115,313 | | | 4.24 | | | Non-vested options at December 31, 2017 | | | 2,641,832 | | | 8.21 | | |
| Information regarding options outstanding by range of exercise prices |
Further information regarding options outstanding under the 2015 Equity Incentive Plan at December 31, 2015 is summarized below: | | | Number of | | Weighted average | | Number of | | Weighted-average | | | | | options | | Remaining | | Exercise | | Options | | Remaining | | Exercise | | | Range of exercise prices | | outstanding | | life in years | | Price | | exercisable | | life in years | | price | | | | | | | | | | | | | | | | | | | | | | | | $2.31 – 4.45 | | | 2,723,092 | | | 8.9 | | $ | 3.64 | | | 1,137,177 | | | 8.9 | | $ | 3.31 | | | $7.34 | | | 1,497,875 | | | 8.0 | | $ | 7.34 | | | 1,333,958 | | | 8.0 | | $ | 7.34 | | | $16.00 – 16.70 | | | 892,000 | | | 10.0 | | $ | 16.06 | | | - | | | 10.0 | | | - | | | | | | 5,112,967 | | | | | | | | | 2,471,135 | | | | | | | | |
| Equity Incentive Plan 2005 [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Summarized information of stock options |
Summarized information for the 2005 Equity Incentive Plan is as follows: | | | | | Weighted- | | | | | | | average | | | | | | | exercise | | | | | Options | | 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 | | | | | | | | | | | | Exercisable at December 31, 2017 | | | 316,760 | | | 14.31 | | |
| Information regarding options outstanding by range of exercise prices |
Further information regarding options outstanding under the 2005 Equity Incentive Plan at December 31, 2017 is summarized below: | | | Number of | | Weighted average | | Number of | | Weighted-average | | | | | options | | Remaining | | Exercise | | options | | Remaining | | Exercise | | | Range of exercise prices | | outstanding | | life in years | | price | | exercisable | | life in years | | price | | | | | | | | | | | | | | | | | | | | | | | | $3.25 | | | 120,000 | | | 3.0 | | $ | 3.25 | | | 120,000 | | | 3.0 | | $ | 3.25 | | | $11.50 - 18.50 | | | 189,000 | | | 7.0 | | $ | 18.35 | | | 189,000 | | | 7.0 | | $ | 18.35 | | | $30.50 – 150.00 | | | 7,760 | | | 3.2 | | $ | 86.79 | | | 7,760 | | | 3.2 | | $ | 86.79 | | | | | | 316,760 | | | | | | | | | 316,760 | | | | | | | | |