BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property, Equipment, Leased Assets, and Placement Fee and Development Agreements (Details)	12 Months Ended
Dec. 31, 2019
Minimum
Property, Plant and Equipment [Line Items]
Estimated life	2 years
Development and Placement Fee Agreements
General term of the agreement	12 months
Maximum
Property, Plant and Equipment [Line Items]
Estimated life	5 years
Development and Placement Fee Agreements
General term of the agreement	83 months

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

No definition available.

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration