OPERATING LEASES (Details) - USD ($)		1 Months Ended
	Sep. 10, 2019	Oct. 31, 2019	Dec. 31, 2019	Oct. 01, 2019	Apr. 30, 2019
Lessee Lease Description [Line Items]
Operating lease, right-of-use assets			$ 2,497,000
Operating lease liability			2,554,000
Operating lease initial term, aggregate minimum future lease payments			$ 8,275,000
Menlo Park Office Space Lease
Lessee Lease Description [Line Items]
Operating lease term, additional period extension	2 months
New Jersey Office Space Lease
Lessee Lease Description [Line Items]
Operating lease, initial term					11 years
Operating lease term, option to extend additional period					5 years
Operating lease, right-of-use assets				$ 2,356,000
Operating lease liability				$ 2,356,000
Operating lease, percentage of discount rate				8.00%
Menlo Park Lease and New Jersey Lease | Maximum
Lessee Lease Description [Line Items]
Operating lease, percentage of discount rate			8.00%
Operating lease,remaining lease term			10 years 9 months 18 days
Menlo Park Lease and New Jersey Lease | Minimum [Member]
Lessee Lease Description [Line Items]
Operating lease, percentage of discount rate			5.00%
Operating lease,remaining lease term			3 months
Foster City Office Space Lease
Lessee Lease Description [Line Items]
Operating lease, initial term		87 months
Operating lease term, option to extend additional period		5 years
Operating lease initial term, aggregate minimum future lease payments		$ 4,400,000
Operating lease, rent abatement period		3 months