STOCKHOLDERS' EQUITY - Stock options (Details) - USD ($)
|
3 Months Ended |
12 Months Ended |
Mar. 31, 2020 |
Mar. 31, 2019 |
Dec. 31, 2019 |
Dec. 31, 2018 |
| STOCKHOLDERS' EQUITY |
|
|
|
|
| Number of Options, Exercised |
|
15,000
|
|
|
| Stock options [Member] |
|
|
|
|
| STOCKHOLDERS' EQUITY |
|
|
|
|
| Number of Options, Outstanding at Beginning of Year |
4,197,000
|
|
|
|
| Number of Options, Grants |
0
|
|
|
|
| Number of Options, Exercised |
0
|
|
|
|
| Number of Option, Forfeited/cancelled/expired/settled |
24,000
|
|
|
|
| Number of Options, Balance at End of Year |
4,173,000
|
|
4,197,000
|
|
| Number of Options, Vested and expected to vest |
4,170,000
|
|
|
|
| Number of Options, Unvested |
17,000
|
|
|
|
| Number of Options, Exercisable |
4,156,000
|
|
|
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| Weighted-Average Exercise Price, Outstanding at Beginning of Year (in dollars per share) |
$ 2.13
|
|
|
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| Weighted-Average Exercise Price, Grants (in dollars per share) |
0.00
|
|
|
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| Weighted-Average Exercise Price, Exercised (in dollars per share) |
0.00
|
|
|
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| Weighted-Average Exercise Price, Forfeited/cancelled/expired/settled (in dollars per share) |
3.17
|
|
|
|
| Weighted-Average Exercise Price, Balance at End of Year (in dollars per share) |
2.12
|
|
$ 2.13
|
|
| Weighted-Average Exercise Price, Vested and expected to vest (in dollars per share) |
2.12
|
|
|
|
| Weighted-Average Exercise Price, Unvested (in dollars per share) |
1.90
|
|
|
|
| Weighted-Average Exercise Price, Exercisable (in dollars per share) |
$ 2.12
|
|
|
|
| Weighted-Average Remaining Contractual Term, Outstanding (in years) |
6 years 5 months 27 days
|
|
6 years 8 months 12 days
|
|
| Weighted-Average Remaining Contractual Term, Vested and expected to vest (in years) |
6 years 5 months 27 days
|
|
|
|
| Weighted-Average Remaining Contractual Term, Unvested (in years) |
7 years 5 months 16 days
|
|
|
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| Weighted-Average Remaining Contractual Term, Exercisable (in years) |
|
|
|
6 years 5 months 23 days
|
| Aggregate Intrinsic Value, Outstanding |
$ 14,458
|
|
$ 255,000
|
|
| Aggregate Intrinsic Value, Vested and expected to vest |
0
|
|
|
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| Aggregate Intrinsic Value, Unvested |
0
|
|
|
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| Aggregate Intrinsic Value, Exercisable |
$ 14,458
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|