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STOCKHOLDERS' EQUITY (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 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		$ 4.08
Warrants issued	147,058		147,058
Common Stock, Shares Authorized	175,000,000		175,000,000		175,000,000
Common stock, par value (in dollars per share)	$ 0.001		$ 0.001		$ 0.001
Stock-based compensation expense	$ 14,000	$ 28,300	$ 46,918	$ 46,768
Warrants [Member]
Warrant purchase price	$ 4.08		$ 4.08
Warrants issued	147,058		147,058
2020 ATM [Member]
Percent of commission rate						3.00%
Amended and Restated 2012 Incentive Plan [Member]
Number of additional shares that may be issued	1,746,700		1,746,700
Amended and Restated 2012 Incentive Plan [Member] | Unvested restricted stock
Restricted stock outstanding	11,992,744		11,992,744
Amended and Restated 2012 Incentive Plan [Member] | Stock options
Restricted stock outstanding	2,467,537		2,467,537

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

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

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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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Face amount or stated value per share of common stock.

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

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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 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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