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STOCKHOLDERS' EQUITY - Share Purchase Warrants (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019
STOCKHOLDERS' EQUITY |  |
Number of Warrants, Beginning balance | 22,664,000 |
Number of Warrants, Exercised for cash | (458,000) |
Number of Warrants, Expired or cancelled | (825,000) |
Number of Warrants, Ending balance | 21,381,000 | 22,664,000
Weighted Average Exercise Price, Beginning Balance | $ 4.71 |
Weighted Average Exercise Price, Exercised for cash | 1.20 |
Weighted Average Exercise Price, Expired or cancelled | 7.10 |
Weighted Average Exercise Price, Ending Balance | $ 4.69 | $ 4.71
Weighted Average Remaining Contractual Life (in years) | 3 years 10 days | 3 years 3 months 29 days
Total Intrinsic Value |  | $ 954,000

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- Definition Number of warrants or rights outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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