On July 29, 2015, the Company's registration statement on Form S-3, as filed with the SEC on July 23, 2015, was declared effective using a "shelf" registration process. Under this shelf registration statement, the Company may issue, in one or more offerings, any combination of common stock, preferred stock, senior or subordinated debt securities, warrants, or units, up to a total dollar amount of $100 million.

No definition available.

STOCKHOLDERS' EQUITY - Additional information (Details)												12 Months Ended
STOCKHOLDERS' EQUITY - Additional information (Details)	Dec. 13, 2023 USD ($) $ / shares shares	Sep. 18, 2023 USD ($) shares	Aug. 28, 2023 shares	Jul. 10, 2023 USD ($) shares	Jul. 07, 2023 USD ($) shares	Jan. 23, 2023 USD ($) shares	Aug. 10, 2022 USD ($) shares	Apr. 01, 2022	Dec. 30, 2021 USD ($)	Apr. 12, 2021 USD ($) shares	Apr. 12, 2021 USN ($) shares	Dec. 31, 2023 USD ($) item $ / shares shares	Dec. 31, 2023 USN ($) shares	Dec. 31, 2022 USD ($) shares	Dec. 31, 2022 USN ($) shares	Dec. 31, 2021 USD ($) shares	Jul. 14, 2021 USD ($)	Dec. 31, 2020 shares	Jun. 30, 2019 shares	May 31, 2019 shares
STOCKHOLDERS' EQUITY
Number of preferred stock authorized \| shares												5,000,000		5,000,000	5,000,000				5,000,000
Common stock, shares authorized \| shares												100,000,000		100,000,000	100,000,000				100,000,000	50,000,000
Issuance of common stock \| shares												0	0
Warrant Exercise Price per Share \| $ / shares												$ 2.00
Aggregate registered amount for offerings																	$ 150,000,000
Number of option granted \| shares												2,601,880	2,601,880	4,086,205	4,086,205	2,051,980
Number of long-term incentive plans \| item												2
Allocated share-based compensation expense												$ 3,329,000		$ 3,424,000		$ 4,021,000
Stock or unit option plan expense												$ 260,000
Grant date exercise price range \| $ / shares												$ 1.11
Total unrecognized compensation cost related to stock options												$ 4,868,000
Amortized period												42 months	42 months
Vested \| shares												(1,273,328)	(1,273,328)
Issuance of restricted stock options												$ 403,939		$ 380,091		$ 928,417
Outstanding \| shares												10,548,174		9,474,824	9,474,824	6,885,978		5,165,204
Forfeited \| shares												974,555	974,555	1,270,155	1,270,155	138,037
Employees
STOCKHOLDERS' EQUITY
Number of option granted \| shares										1,323,400	1,323,400
Percentage of milestone activity met by the company								19.00%
Grant date fair value of unvested options											$ 7,042,000
Stock or unit option plan expense												$ 320,000		$ 314,000
Employee Stock
STOCKHOLDERS' EQUITY
Outstanding \| shares												281,000		196,900	196,900	281,880
December 13, 2023 Offering
STOCKHOLDERS' EQUITY
Issuance of common stock \| shares	7,733,090
Warrants to purchase shares \| shares	2,706,561
Number of common stock purchased by each warrant \| shares	0.35
Average selling price \| $ / shares	$ 1.33
Net proceeds excluding proceeds received upon exercise of warrants	$ 9,785,000
Warrant Exercise Price per Share \| $ / shares	$ 2.00
Net proceeds from issuance of stock	$ 10,285,000
Common Stock
STOCKHOLDERS' EQUITY
Issuance of common stock \| shares												10,389,554	10,389,554
Stock or unit option plan expense												$ 104,000
Issuance of restricted stock options												130		$ 145		$ 107
Common Stock \| First anniversary of the date of the grant
STOCKHOLDERS' EQUITY
Unvested options in fair value					$ 426,000
Restricted stock
STOCKHOLDERS' EQUITY
Stock or unit option plan expense												$ 0
Stock issued during period, shares, restricted stock award, gross \| shares			60,000			30,000						250,000	250,000
Stock issued during period, value, restricted stock sward, gross						$ 64,200						$ 883,000
RSU Forfeited \| shares						2,500						204,087	204,087
Issuance of restricted stock options												$ 80,000		(16,000)
Options to grant (in shares) \| shares												385,000	385,000
Employee stock options
STOCKHOLDERS' EQUITY
Stock or unit option plan expense												$ 113,000		101,000
Employee stock options \| Employees
STOCKHOLDERS' EQUITY
Aggregate intrinsic value												135,000
Grant date fair value of these unvested options												135,000
Stock or unit option plan expense												34,000
Executive Officer, Director And Non-executive Officer Employees [Member] \| December 13, 2023 Offering
STOCKHOLDERS' EQUITY
Net proceeds excluding proceeds received upon exercise of warrants	$ 435,000
Employee one
STOCKHOLDERS' EQUITY
Number of options granted \| shares							1,163,800
Allocated share-based compensation expense												1,381,000
Employee Stock
STOCKHOLDERS' EQUITY
Number of options granted \| shares					1,138,750
Employee Stock \| Second anniversary of the date of the grant
STOCKHOLDERS' EQUITY
Unvested options in fair value					$ 178,000
Employee Stock \| Second anniversary of the date of the grant
STOCKHOLDERS' EQUITY
Unvested options in fair value					$ 2,665,000
Employee Stock \| Common Stock
STOCKHOLDERS' EQUITY
Number of options granted \| shares					56,130
Employee two
STOCKHOLDERS' EQUITY
Number of option granted \| shares							772,905
Aggregate intrinsic value												917,000
Grant date fair value of these unvested options												917,000
Allocated share-based compensation expense					$ 59,000							201,000		90,000
Board of directors
STOCKHOLDERS' EQUITY
Number of option granted \| shares							113,850
Board of directors \| First anniversary of the date of the grant
STOCKHOLDERS' EQUITY
Unvested options in fair value					$ 234,000
Board of directors \| Common Stock
STOCKHOLDERS' EQUITY
Number of option granted \| shares					100,000
Chief Executive Officer
STOCKHOLDERS' EQUITY
Stock or unit option plan expense												23,000
Options to purchase common stock vested \| shares				70,000
Chief Executive Officer \| First anniversary of the date of the grant
STOCKHOLDERS' EQUITY
Unvested options in fair value					$ 47,000
Chief Executive Officer \| Common Stock
STOCKHOLDERS' EQUITY
Number of options granted \| shares					20,000
Senior managers
STOCKHOLDERS' EQUITY
Number of option granted \| shares					424,000
Stock or unit option plan expense												285,000
Senior managers \| First anniversary of the date of the grant
STOCKHOLDERS' EQUITY
Unvested options in fair value					$ 992,000
Senior managers \| Common Stock
STOCKHOLDERS' EQUITY
Number of options granted \| shares					182,000
Senior manager one
STOCKHOLDERS' EQUITY
Number of option granted \| shares							473,750
Aggregate intrinsic value												562,000
Grant date fair value of these unvested options												562,000
Stock or unit option plan expense												107,000		$ 161,000
Senior manager two \| Employee stock options
STOCKHOLDERS' EQUITY
Number of option granted \| shares							1,365,000
Aggregate intrinsic value												1,620,000
Grant date fair value of these unvested options												1,620,000
Stock or unit option plan expense													$ 0		$ 0
Existing 2022-2025 performance
STOCKHOLDERS' EQUITY
Number of option granted \| shares					115,000
Stock or unit option plan expense												$ 0
Existing 2022-2025 performance \| Second anniversary of the date of the grant
STOCKHOLDERS' EQUITY
Unvested options in fair value					$ 320,000
MR. D Amico
STOCKHOLDERS' EQUITY
Number of options granted \| shares				25,000
MR. D Amico \| First anniversary of the date of the grant
STOCKHOLDERS' EQUITY
Options to grant (in shares) \| shares				15,000
MR. D Amico \| Common Stock
STOCKHOLDERS' EQUITY
Shares issued other (in shares) \| shares				215,000
MR. D Amico \| Restricted stock
STOCKHOLDERS' EQUITY
Number of option granted \| shares				15,000
Options to purchase common stock vested \| shares				45,000
Shares vested and expected vest value				$ 157,000
Revision of prior period adjustment
STOCKHOLDERS' EQUITY
Outstanding \| shares														1,365,000	1,365,000
2006 Stock Option Plan
STOCKHOLDERS' EQUITY
Common stock reserved for issuance \| shares												2,400,000
Outstanding \| shares												320,000
2014 Stock Option Plan
STOCKHOLDERS' EQUITY
Common stock reserved for issuance \| shares												13,400,000
Outstanding \| shares												647,000
April 12, 2021 performance based award \| Restricted stock
STOCKHOLDERS' EQUITY
Stock issued during period, shares, restricted stock award, gross \| shares										235,765	235,765
Stock issued during period, value, restricted stock sward, gross										$ 2,120,000
Issuance of restricted stock options												$ (245,000)		$ 226,000
April 12, 2021 performance based award \| Restricted stock \| First anniversary of the date of the grant
STOCKHOLDERS' EQUITY
Vesting percentage										33.30%	33.30%
April 12, 2021 performance based award \| Restricted stock \| Second anniversary of the date of the grant
STOCKHOLDERS' EQUITY
Vesting percentage										33.30%	33.30%
April 12, 2021 performance based award \| Restricted stock \| Second anniversary of the date of the grant
STOCKHOLDERS' EQUITY
Vesting percentage										33.30%	33.30%
August 10, 2022 performance based award
STOCKHOLDERS' EQUITY
Allocated share-based compensation expense												311,000
Stock or unit option plan expense														180,000
August 10, 2022 performance based award \| Restricted stock
STOCKHOLDERS' EQUITY
Stock issued during period, shares, restricted stock award, gross \| shares							288,500
Stock issued during period, value, restricted stock sward, gross							$ 563,000
Issuance of restricted stock options												267,000		260,000
August 10, 2022 performance based award \| Restricted stock \| First anniversary of the date of the grant
STOCKHOLDERS' EQUITY
Vesting percentage							33.30%
August 10, 2022 performance based award \| Restricted stock \| Second anniversary of the date of the grant
STOCKHOLDERS' EQUITY
Vesting percentage							33.30%
August 10, 2022 performance based award \| Restricted stock \| Second anniversary of the date of the grant
STOCKHOLDERS' EQUITY
Vesting percentage							33.30%
July 07, 2023 performance based award \| Restricted stock
STOCKHOLDERS' EQUITY
Issuance of restricted stock options												213,000		0
September 18, 2023 performance based award
STOCKHOLDERS' EQUITY
Stock issued during period, shares, restricted stock award, gross \| shares		45,000
Stock issued during period, value, restricted stock sward, gross		$ 89,000
September 18, 2023 performance based award \| Restricted stock
STOCKHOLDERS' EQUITY
Issuance of restricted stock options												$ 55,000		0
Jefferies LLC and B. Riley FBR, Inc
STOCKHOLDERS' EQUITY
Issuance of common stock \| shares												2,656,464	2,656,464
Aggregate offering price									$ 25,000,000
Net proceeds from issuance of stock													$ 4,532,000	$ 45,000
Commission rate (as a percent)												3.00%
Net proceeds from issuance of stock												$ 61,000
Average selling price \| $ / shares												$ 1.76