SUPPLEMENTARY FINANCIAL DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SUPPLEMENTARY FINANCIAL DATA (UNAUDITED)
Revenue	$ 29,499	$ 12,427	$ 26,150	$ 5,338	$ 15,737	$ 12,838	$ 23,476	$ 8,319	$ 73,414	$ 60,370	$ 15,386
Costs and expenses	100,071	77,628	68,626	79,004	78,358	75,288	72,180	73,295	325,329	299,121	275,509
Loss from operations	(70,572)	(65,201)	(42,476)	(73,666)	(62,621)	(62,450)	(48,704)	(64,976)	(251,915)	(238,751)	(260,123)
Net loss	$ (65,606)	$ (58,431)	$ (39,838)	$ (72,580)	$ (50,186)	$ (59,433)	$ (40,818)	$ (65,087)	$ (236,455)	$ (215,524)	$ (285,405)
Basic and diluted net loss per share (in dollars per share)	$ (1.17)	$ (1.05)	$ (0.72)	$ (1.32)	$ (0.92)	$ (1.10)	$ (0.76)	$ (1.22)	$ (4.25)	$ (3.99)	$ (5.45)

The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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