BUSINESS COMBINATION - Pro Forma (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Business Combinations [Abstract]
Revenues	$ 0		$ 0
Loss attributable to Menlo	4,100		23,737
SUPPLEMENTAL PRO FORMA COMBINED RESULTS OF OPERATIONS:
Revenues	3,269	$ 0	16,707	$ 308
Net loss	$ 24,912	$ 40,016	$ 229,994	$ 109,563
Loss per share - basic (in USD per share)	$ 0.15	$ 0.66	$ 1.88	$ 1.82
Loss per share - diluted (in dollars per share)	$ 0.15	$ 0.66	$ 1.88	$ 1.82
Adjustments to the supplemental pro forma combined results of operations, included in the above, are as follows:
Transaction costs	$ 0	$ 0	$ (14,931)	$ 0
Acceleration of stock based compensation	0	0	(7,199)	0
Total Adjustments	$ 0	$ 0	$ (22,130)	$ 0

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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