COMMON STOCK PURCHASE WARRANTS - Warrant Activity (Details) - Common stock purchase warrants - $ / shares shares in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Number of Options
Number of Options Outstanding, beginning	11,842	1,842
Number of Options, Issued	0	0
Number of Options, Exercised	0	0
Number of Options, Expired	0	0
Number of Options, Modification	0	0
Number of Options Outstanding, ending	11,842	1,842
Weighted Average Exercise Price
Weighted Average Exercise Price, beginning	$ 0.10	$ 0.59
Weighted Average Exercise Price, Issued	0.00	0
Weighted Average Exercise Price, Exercised	0	0
Weighted Average Exercise Price, Expired	0	0
Weighted Average Exercise Price, Modification	0	0
Weighted Average Exercise Price, ending	$ 0.10	$ 0.59

Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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Gross number of share options (or share units) granted during the period.

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Number of options outstanding, including both vested and non-vested options.

+ References

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The increase or decrease in number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding, including vested options.

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Change in the weighted average exercise price of options outstanding.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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- Definition

Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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