STRATEGIC ALLIANCE AND COLLABORATION WITH SERVIER (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Total revenue	$ 168,000	$ 2,514,000	$ 996,000	$ 2,886,000
Amounts incurred but not yet billed					$ 300,000
Accounts receivable	248,000		248,000		108,000
Servier
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Accounts receivable	$ 0		0		$ 0
Research and Development Reimbursable Costs
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Total revenue		$ 2,498,000	$ 681,000	$ 2,846,000