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STOCKHOLDERS' EQUITY DEFICIT - Warrants (Details) - $ / shares shares in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Jun. 30, 2019
Class of Warrant or Right [Line Items] |  |
Exercise price per warrant (in dollars per share) |  | $ 1.47
Warrant Or Right Outstanding [Roll Forward] |  |
Warrants outstanding, beginning balance (in shares) | 2,247 |
Warrants Issued (in shares) | 0 |
Warrants Exercised (in shares) | (2,048) |
Warrants Cancelled (in shares) | 0 |
Warrants outstanding, ending balance (in shares) | 199 |
Warrants, Expiring June 2020 |  |
Class of Warrant or Right [Line Items] |  |
Exercise price per warrant (in dollars per share) | $ 1.47 |
Warrant Or Right Outstanding [Roll Forward] |  |
Warrants outstanding, beginning balance (in shares) | 0 |
Warrants Issued (in shares) | 0 |
Warrants Exercised (in shares) | 0 |
Warrants Cancelled (in shares) | 0 |
Warrants outstanding, ending balance (in shares) | 0 |
Warrants, Expiring March 2023 |  |
Class of Warrant or Right [Line Items] |  |
Exercise price per warrant (in dollars per share) | $ 0.55 |
Warrant Or Right Outstanding [Roll Forward] |  |
Warrants outstanding, beginning balance (in shares) | 1,705 |
Warrants Issued (in shares) | 0 |
Warrants Exercised (in shares) | (1,573) |
Warrants Cancelled (in shares) | 0 |
Warrants outstanding, ending balance (in shares) | 132 |
Warrants, Expiring November 2022 |  |
Class of Warrant or Right [Line Items] |  |
Exercise price per warrant (in dollars per share) | $ 0.55 |
Warrant Or Right Outstanding [Roll Forward] |  |
Warrants outstanding, beginning balance (in shares) | 487 |
Warrants Issued (in shares) | 0 |
Warrants Exercised (in shares) | (475) |
Warrants Cancelled (in shares) | 0 |
Warrants outstanding, ending balance (in shares) | 12 |
Warrants, Expiring November 2024, Issued May 2015 |  |
Class of Warrant or Right [Line Items] |  |
Exercise price per warrant (in dollars per share) | $ 11.83 |
Warrant Or Right Outstanding [Roll Forward] |  |
Warrants outstanding, beginning balance (in shares) | 28 |
Warrants Issued (in shares) | 0 |
Warrants Exercised (in shares) | 0 |
Warrants Cancelled (in shares) | 0 |
Warrants outstanding, ending balance (in shares) | 28 |
Warrants, Expiring November 2024, Issued November 2014 |  |
Class of Warrant or Right [Line Items] |  |
Exercise price per warrant (in dollars per share) | $ 11.04 |
Warrant Or Right Outstanding [Roll Forward] |  |
Warrants outstanding, beginning balance (in shares) | 27 |
Warrants Issued (in shares) | 0 |
Warrants Exercised (in shares) | 0 |
Warrants Cancelled (in shares) | 0 |
Warrants outstanding, ending balance (in shares) | 27 |

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- Definition Class Of Warrant Or Right, Issued During The Period + References No definition available. + Details
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- Definition Class Of Warrant Or Right Number Of Expirations During The Period + References No definition available. + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644 + Details
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