CONVERTIBLE PROMISSORY NOTES - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended	6 Months Ended
	Aug. 31, 2019	Mar. 31, 2019	Jun. 30, 2019	Jun. 30, 2020	Aug. 31, 2019	Jun. 30, 2019
Short-term Debt [Line Items]
Proceeds from issuance of convertible promissory notes				$ 0		$ 5,127
Warrant liability		$ 1,500
Derivative liability, fair value		$ 1,400
Convertible Promissory Notes
Short-term Debt [Line Items]
Stated rate		12.00%
Debt term		1 year
Proceeds from issuance of convertible promissory notes					$ 7,400
Conversion price (in usd per share)	$ 7.54				$ 7.54
Coverage percent		50.00%
Stock issuable upon warrants (in shares)		490,683
Warrants term				5 years
Exercise price (in usd per share)		$ 10.36
Interest expense			$ (500)			(500)
Accretion of discounts			$ 400			$ 400
Effective rate				12.00%
Convertible Promissory Notes | Common Stock
Short-term Debt [Line Items]
Shares issued in conversion (in shares)	1,069,740
Officers and Directors | Convertible Promissory Notes
Short-term Debt [Line Items]
Proceeds from issuance of convertible promissory notes					$ 1,700