Refers to the percent of commission of gross proceeds from the sale of common stock sold paid to agents.

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- Definition

Exercise price per share or per unit of warrants or rights outstanding.

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- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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- Definition

Face amount or stated value per share of common stock.

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- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

+ References

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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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-Paragraph 2
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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Amount of noncash expense for share-based payment arrangement.

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

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STOCKHOLDERS' EQUITY (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Sep. 05, 2019
Preferred stock, shares authorized	10,000,000		10,000,000
Preferred stock, par value (in dollars per share)	$ 0.001		$ 0.001
Warrant purchase price	$ 4.08
Warrants issued	147,058
Common Stock, Shares Authorized	150,000,000		150,000,000
Common stock, par value (in dollars per share)	$ 0.001		$ 0.001
Treasury stock, shares	41,309		41,309
Treasury stock issued	$ 234		$ 234
Expenses on stock options	$ 16,618	$ 11,068
Warrants [Member]
Warrant purchase price	$ 4.08
Warrants issued	147,058
Unvested Restricted Stock [Member]
Restricted stock outstanding	10,974,039		10,785,034
Expenses on stock options	$ 16,000	7,100
Weighted-average period of recognition for total unrecognized compensation expense related to unvested time-based restricted stock	1 year
Total unrecognized compensation expense related to unvested time-based restricted stock	$ 79,500
Number of shares granted	893,488
Employee Stock Option [Member]
Expenses on stock options	$ 600	$ 3,900
Weighted-average period of recognition for total unrecognized compensation expense related to unvested time-based restricted stock	1 year 3 months 18 days
Total unrecognized compensation expense related to unvested time-based restricted stock	$ 1,200
Number of shares granted	0	0
Milestone Based Restricted Stock [Member]
Restricted stock outstanding	2,910,511
2020 ATM [Member]
Percent of commission rate				3.00%
Amended and Restated 2012 Incentive Plan [Member]
Number of additional shares that may be issued	3,187,593
Amended and Restated 2012 Incentive Plan [Member] \| Unvested Restricted Stock [Member]
Restricted stock outstanding	10,974,039
Amended and Restated 2012 Incentive Plan [Member] \| Employee Stock Option [Member]
Restricted stock outstanding	2,490,396