Quarterly Financial Data (Unaudited) (Narrative) (Detail) - USD ($) $ / shares in Units, $ in Thousands	2 Months Ended	3 Months Ended						8 Months Ended	12 Months Ended
	Aug. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Aug. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Effect of Fourth Quarter Events [Line Items]
Revenues	$ 4,115	$ 5,211	$ 5,995	$ 8,521	$ 8,031	$ 7,458	$ 6,696	$ 15,321	$ 30,706	$ 32,028
Net Income (Loss) Attributable to Parent	$ 4,398	$ (49,971)	$ (31,723)	$ (54,888)	$ (17,784)	$ (4,419)	$ 6,680	$ (77,296)	$ (70,411)	$ (68,859)
Income (Loss) from Continuing Operations, Per Basic Share	$ (0.10)	$ (0.11)	$ (0.15)	$ (0.25)	$ (0.10)	$ (0.07)	$ (0.07)	$ (0.36)	$ (0.48)	$ (0.22)
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share	0.14	(0.32)	(0.11)	(0.23)	(0.06)	0.03	0.12	(0.30)	(0.11)	(0.25)
Income (Loss) from Continuing Operations, Per Diluted Share	(0.10)	(0.11)	(0.15)	(0.25)	(0.10)	(0.07)	(0.07)	(0.36)	(0.48)	(0.22)
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share	0.14	(0.32)	(0.11)	(0.23)	(0.06)	0.03	0.12	(0.30)	(0.11)	(0.25)
Net income per basic share (in Dollars per Share)	0.04	(0.43)	(0.26)	(0.48)	(0.16)	(0.04)	0.05	(0.66)	(0.59)	(0.47)
Net income per diluted share (in Dollars per Share)	$ 0.04	$ (0.43)	$ (0.26)	$ (0.48)	$ (0.16)	$ (0.04)	$ 0.05	$ (0.66)	$ (0.59)	$ (0.47)
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ (10,852)	$ (12,929)	$ (19,259)	$ (28,817)	$ (11,811)	$ (8,016)	$ (8,450)	$ (43,040)	$ (57,094)	$ (32,765)
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	$ 15,236	$ (37,399)	$ (12,752)	$ (26,011)	$ (6,155)	$ 3,502	$ 15,067	$ (34,915)	$ (13,597)	$ (36,094)