WARRANTS - Narrative (Details)						1 Months Ended		2 Months Ended	12 Months Ended		34 Months Ended	37 Months Ended
	Sep. 28, 2020 shares	Jun. 17, 2020 shares	Feb. 11, 2020 shares	Sep. 28, 2017 $ / shares shares	Jun. 17, 2013 $ / shares shares	Aug. 31, 2020 shares	Jun. 30, 2018 shares	Oct. 31, 2017 tranche $ / shares shares	Dec. 31, 2021 shares	Dec. 31, 2020 shares	Nov. 30, 2017 shares	Sep. 28, 2020	Dec. 31, 2019 shares	Oct. 02, 2017 shares
Warrant liabilities
Sales of common stock, net of offering costs (in shares)			201,000
Warrant
Warrant liabilities
Warrant exercised/expired (in shares)										2,134,362
Class of warrant or right, outstanding (in shares)									0	0			2,134,362
Placement Agents
Warrant liabilities
Period start after closing									6 months
Implied unit price/stock price (in dollars per share) | $ / shares				$ 4.85
Placement Agents | Private Placement, Offering One
Warrant liabilities
Sold in private placement (in shares)				87,279
Placement Agents | Private Placement, Offering Two
Warrant liabilities
Sold in private placement (in shares)				11,567
Consulting Warrant | Warrant
Warrant liabilities
Warrant exercised/expired (in shares)										6,667
Class of warrant or right, outstanding (in shares)										0			6,667
Consulting Warrant | MDB
Warrant liabilities
Warrant term					7 years
Warrants to purchase shares of common stock or units (in shares)					222,222
Exercise price (in dollars per share) | $ / shares					$ 0.01
Warrants exercisable period from underwriting agreement					6 months
Financing Warrant | Warrant
Warrant liabilities
Warrant exercised/expired (in shares)										62,530
Class of warrant or right, outstanding (in shares)										0			62,530
Financing Warrant | MDB
Warrant liabilities
Warrant term					7 years
Warrants to purchase shares of common stock or units (in shares)					208,763
Exercise price (in dollars per share) | $ / shares					$ 3.35
Warrants exercisable period from underwriting agreement					6 months
Warrant exercised/expired (in shares)		62,530									146,233
Private Placement Warrants, September 2017
Warrant liabilities
Warrant exercised/expired (in shares)	1,961,000						10,600
Cancellation of warrants (in shares)						5,319
Private Placement Warrants, September 2017 | Warrant
Warrant liabilities
Warrant exercised/expired (in shares)										1,966,319
Cancellation of warrants (in shares)										5,319
Class of warrant or right, outstanding (in shares)										0			1,966,319
Private Placement Warrants, September 2017 | Private Placement
Warrant liabilities
Warrants to purchase shares of common stock or units (in shares)				1,745,581				1,976,919						231,338
Class Of Warrant Or Right, Number Of Tranches | tranche								2
Period start after closing												6 months
Private Placement Warrants, September 2017 | Investors, Executives and Board Members | Capital Units
Warrant liabilities
Exercise price (in dollars per share) | $ / shares								$ 4.85
Private Placement Warrants, September 2017 | Investors, Executives and Board Members | Capital Units | Private Placement
Warrant liabilities
Sales of common stock, net of offering costs (in shares)								1,976,919
Underwriting Warrant
Warrant liabilities
Sales of common stock, net of offering costs (in shares)				1,976,919
Underwriting Warrant | Placement Agents
Warrant liabilities
Sales of common stock, net of offering costs (in shares)				98,846