LIQUIDITY AND NEED FOR ADDITIONAL CAPITAL (Details Narrative) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended	6 Months Ended
	Jan. 22, 2021	Jan. 14, 2021	Mar. 31, 2021	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accumulated deficit				$ 498,800
Cash and cash equivalents				$ 32,614		$ 25,522
Sale of stock, number of shares issued in transaction		6,670,000
Common stock, par or stated value per share		$ 0.001		$ 0.001		$ 0.001
Class of warrant or right, number of securities called by warrants or rights				18,372,496
Proceeds from Warrant Exercises	$ 900			$ 6,671
Letter Agreement [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Class of warrant right exercise price	$ 0.624
Agreement description	The holder of the warrants may not exercise any portion of the warrants to the extent that the holder would own more than 4.99% of the outstanding common stock immediately after exercise, which percentage may be changed at the holder’s election to a lower percentage at any time or to a higher percentage not to exceed 9.99% upon 61 days’ notice to the Company. The Company also issued to designees of the placement agent for the registered direct offering in December 2020, warrants to purchase 6.0% of the aggregate number of new warrants issued under the letter agreement (or warrants to purchase up to 480,962 shares of common stock).
Share-based compensation arrangement by share-based payment award, non-option equity instruments, exercised	10,688,043
Letter Agreement [Member] | Holder [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Common stock, par or stated value per share	$ 0.001
Shares issued price per share	0.125
Class of warrant right exercise price	$ 1.20
Maximum [Member] | Letter Agreement [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Class of warrant or right, number of securities called by warrants or rights	10,688,043
Maximum [Member] | Letter Agreement [Member] | Holder [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Class of warrant or right, number of securities called by warrants or rights	8,016,033
Pre-funded Warrants [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Class of warrant right exercise price		$ 1.375		$ 0.001
Warrant exercise percentage		125.00%
IPO [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Common stock, par or stated value per share		$ 0.001
Agreement description			The holder of the warrants may not exercise any portion of the warrants to the extent that the holder would own more than 4.99% of the outstanding common stock immediately after exercise, which percentage may be changed at the holder’s election to a lower percentage at any time or to a higher percentage not to exceed 9.99% upon 61 days’ notice to the Company. The Company also issued to designees of the placement agent for the registered direct offering, warrants to purchase up to 6.0% of the aggregate number of common stock shares and pre-funded warrants sold in the offering (or warrants to purchase up to 545,455 shares of common stock).
IPO [Member] | Maximum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Class of warrant or right, number of securities called by warrants or rights		9,090,910
IPO [Member] | Pre-Funded Warrant [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Class of warrant or right, number of securities called by warrants or rights		2,420,910
Shares issued price per share		$ 1.099
Class of warrant right exercise price		0.001
IPO [Member] | Common Stock and Warrant [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Shares issued price per share		1.100
IPO [Member] | Warrant [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Shares issued price per share		1.10
Class of warrant right exercise price		$ 1.20
Private Placement [Member] | Maximum [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Class of warrant or right, number of securities called by warrants or rights		545,455
Private Placement [Member] | Warrant [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Proceeds from Warrant Exercises	$ 6,700	$ 9,200