SHARE-BASED COMPENSATION, STOCK OPTIONS, AND RESTRICTED SECURITIES (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended		6 Months Ended		52 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Sep. 30, 2019	Dec. 31, 2019	Apr. 30, 2015	Mar. 31, 2015
Stock options
Expected term					10 years
Vesting period					48 months
Stock issued under ESPP (in shares)		36
Stock-based compensation (in dollars)			$ 45	$ 68	$ 115	$ 135
Stock Options
Stock options
Stock-based compensation (in dollars)			$ 21	$ 43	$ 64	$ 84
2010 Plan
Stock options
Granted (in shares)							0
Expected term					10 years
2015 Plan
Stock options
Shares available for future grants			26,670		26,670
Shares authorized for issuance									5,333
Expected term					10 years
2015 Plan Amendment [Member]
Stock options
Shares authorized for issuance	32,000
Increase in shares of common stock reserved for issuance (in shares)	26,667
2007 Plan
Stock options
Expected term					10 years
Employee Stock Purchase Plan
Stock options
Shares authorized for issuance										250
Aggregate number of shares reserved for issuance			264		264			264
Increased share reserve					67
Offering Period		6 months
Stock-based compensation (in dollars)					$ 0
Common Stock
Stock options
Stock issued under ESPP (in shares)					0	36