STOCKHOLDERS' EQUITY (Schedule of Warrants) (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Jan. 31, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Class of Stock [Line Items]
Underlying shares (in shares)		831,901		831,901
Warrants expired		0	832	239	2,420
Warrants Not Assumed in Merger, Expiring June 2022, Group A [Member]
Class of Stock [Line Items]
Underlying shares (in shares)		2,540		2,540
Exercise price (in dollars per share)		$ 41.25		$ 41.25
Warrants Not Assumed in Merger, Expiring June 2022, Group B [Member]
Class of Stock [Line Items]
Underlying shares (in shares)		500		500
Exercise price (in dollars per share)		$ 7.50		$ 7.50
Warrants Not Assumed In Merger, Expiring June 2022 Group C [Member]
Class of Stock [Line Items]
Underlying shares (in shares)		6,095		6,095
Exercise price (in dollars per share)		$ 105.00		$ 105.00
Warrants Not Assumed in Merger, Expiring August 2022, Group A [Member]
Class of Stock [Line Items]
Underlying shares (in shares)		25,201		25,201
Exercise price (in dollars per share)		$ 0.40		$ 0.40
Warrants Not Assumed in Merger, Expiring August 2022, Group B [Member]
Class of Stock [Line Items]
Underlying shares (in shares)		4,000		4,000
Exercise price (in dollars per share)		$ 46.88		$ 46.88
Warrants Not Assumed in Merger, Expiring August 2022, Group C [Member]
Class of Stock [Line Items]
Underlying shares (in shares)		47,995		47,995
Exercise price (in dollars per share)		$ 150.00		$ 150.00
Warrants Not Assumed in Merger, Expiring August 2022, Group D [Member]
Class of Stock [Line Items]
Underlying shares (in shares)		9,101		9,101
Exercise price (in dollars per share)		$ 7.50		$ 7.50
Warrants Not Assumed In Merger, Expiring August 2022 Group E [Member]
Class of Stock [Line Items]
Underlying shares (in shares)		16,664		16,664
Exercise price (in dollars per share)		$ 0.40		$ 0.40
Warrants Not Assumed In Merger, Expiring August2022 Group F [Member]
Class of Stock [Line Items]
Underlying shares (in shares)		7,335		7,335
Exercise price (in dollars per share)		$ 0.40		$ 0.40
Warrants Not Assumed in Merger, Expiring October 2022 Group A [Member]
Class of Stock [Line Items]
Underlying shares (in shares)		666		666
Exercise price (in dollars per share)		$ 0.40		$ 0.40
Warrants Not Assumed in Merger, Expiring October 2022 Group B [Member]
Class of Stock [Line Items]
Underlying shares (in shares)		7,207		7,207
Exercise price (in dollars per share)		$ 112.50		$ 112.50
Warrants Not Assumed In Merger, Expiring April 2023 Group A [Member]
Class of Stock [Line Items]
Underlying shares (in shares)		69,964		69,964
Exercise price (in dollars per share)		$ 5.40		$ 5.40
Warrants Not Assumed In Merger, Expiring April 2023 Group B [Member]
Class of Stock [Line Items]
Underlying shares (in shares)		78,414		78,414
Exercise price (in dollars per share)		$ 5.40		$ 5.40
Warrants Not Assumed in Merger, Expiring October 2022 Group C [Member]
Class of Stock [Line Items]
Underlying shares (in shares)		15,466		15,466
Exercise price (in dollars per share)		$ 11.25		$ 11.25
Warrants Not Assumed In Merger, Expiring July 2023 Group A [Member]
Class of Stock [Line Items]
Underlying shares (in shares)		14,671		14,671
Exercise price (in dollars per share)		$ 5.40		$ 5.40
Warrants Not Assumed In Merger, Expiring July 2023 Group B [Member]
Class of Stock [Line Items]
Underlying shares (in shares)		14,672		14,672
Exercise price (in dollars per share)		$ 5.40		$ 5.40
Warrants Not Assumed In Merger, Expiring August 2023 Group A [Member]
Class of Stock [Line Items]
Underlying shares (in shares)		20,903		20,903
Exercise price (in dollars per share)		$ 5.40		$ 5.40
Warrants Not Assumed In Merger, Expiring August 2023 Group B [Member]
Class of Stock [Line Items]
Underlying shares (in shares)		20,903		20,903
Exercise price (in dollars per share)		$ 5.40		$ 5.40
Warrants Not Assumed In Merger, Expiring September 2023 Group A [Member]
Class of Stock [Line Items]
Underlying shares (in shares)		19,816		19,816
Exercise price (in dollars per share)		$ 5.40		$ 5.40
Warrants Not Assumed In Merger, Expiring September 2023 Group B [Member]
Class of Stock [Line Items]
Underlying shares (in shares)		20,903		20,903
Exercise price (in dollars per share)		$ 5.40		$ 5.40
Warrants Not Assumed In Merger, Expiring November 2023 [Member]
Class of Stock [Line Items]
Underlying shares (in shares)		75,788		75,788
Exercise price (in dollars per share)		$ 5.40		$ 5.40
Warrants Not Assumed In Merger, Expiring December 2023 [Member]
Class of Stock [Line Items]
Underlying shares (in shares)		51,282		51,282
Exercise price (in dollars per share)		$ 5.40		$ 5.40
Warrants Not Assumed In Merger, Expiring April 2024 [Member]
Class of Stock [Line Items]
Underlying shares (in shares)		147,472		147,472
Exercise price (in dollars per share)		$ 5.40		$ 5.40
Warrants Not Assumed In Merger, Expiring May 2024 [Member]
Class of Stock [Line Items]
Underlying shares (in shares)		154,343		154,343
Exercise price (in dollars per share)		$ 9.56		$ 9.56
2016 Warrant Liability [Member]
Class of Stock [Line Items]
Warrants outstanding (in shares)		357		357
Settlement of warrant liability	$ 0.1