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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 |  |  |  |

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