SIGNIFICANT ACCOUNTING POLICIES SIGNIFICANT ACCOUNTING POLICIES - Series A Preferred Stock (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Redeemable Convertible Preferred Stock [Roll Forward]
Less issuance costs, net of accretion	$ 0	$ (396)
Accretion of issuance costs	0	396
Series A Preferred Stock
Redeemable Convertible Preferred Stock [Roll Forward]
Beginning Balance	21,747	0
Issuance of redeemable preferred stock		22,000
Less issuance costs, net of accretion	(58)	(253)
Accretion of issuance costs	58	253
Ending Balance	$ 21,805	$ 21,747