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REDEEMABLE PREFERRED STOCK - Narrative (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Class of Stock [Line Items] |  |  |
Gross proceeds from issuance of preferred stock and warrants | $ 147,864,000 |  |
Issuance offering costs for preferred stock and warrants | 12,043,000 |  |
Non-issuance offering costs for preferred stock and warrants | $ 7,063,000 |  |
Series A Preferred Warrants |  |  |
Class of Stock [Line Items] |  |  |
Warrants issued (in shares) | 4,603,287 |  |
Gross proceeds from issuance of preferred stock and warrants | $ 761,000 |  |
Issuance offering costs for preferred stock and warrants | 142,000 |  |
Reclassification to deferred rent receivable and charges | $ 5,000 |  |
Warrants outstanding (in shares) | 4,603,287 |  |
Series A Preferred Stock |  |  |
Class of Stock [Line Items] |  |  |
Gross proceeds from issuance of preferred stock and warrants | $ 146,651,000 |  |
Issuance offering costs for preferred stock and warrants | 11,889,000 |  |
Reclassification to deferred rent receivable and charges | $ 1,152,000 |  |
Preferred stock, shares outstanding (in shares) | 5,915,816 |  |
Preferred stock, shares redeemed (in shares) | 87,238 |  |
Series A Preferred Stock | Preferred Stock, Shares Issued, One |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock, shares issued (in shares) | 5,896,536 |  |
Series A Preferred Stock | Preferred Stock, Shares Issued, Two |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock, shares issued (in shares) | 106,518 |  |
Net proceeds from issuance of Series Preferred Stock | $ 0 |  |
Series D Preferred Stock |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock, shares issued (in shares) | 18,737 |  | 0
Gross proceeds from issuance of preferred stock and warrants | $ 452,000 |  |
Net proceeds from issuance of Series Preferred Stock | 446,000 | $ 0 |
Issuance offering costs for preferred stock and warrants | 12,000 |  |
Reclassification to deferred rent receivable and charges | $ 4,000 |  |
Preferred stock, shares outstanding (in shares) | 18,737 | 0 | 0
Preferred stock, shares redeemed (in shares) | 0 |  |
Series A Preferred Unit |  |  |
Class of Stock [Line Items] |  |  |
Number of securities called by warrants or rights (in shares) | 1,194,159 |  |

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