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SHARE-BASED COMPENSATION - Summary (Details) $ / shares in Units, $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 10, 2020 $ / shares shares | Feb. 11, 2019 $ / shares shares | Feb. 12, 2018 $ / shares shares | Dec. 31, 2020 USD ($) installment $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Number of shares authorized (shares) |  |  |  | 10,400,000 |  |
Share-based compensation cost capitalized as part of real estate assets | $ |  |  |  | $ 20 | $ 66 | $ 287
Weighted-Average Grant Date Fair Value |  |  |  |  |  |
Unrecognized compensation cost related to nonvested stock awards | $ |  |  |  | $ 1,944 |  |
Compensation cost to be recognized over a weighted-average period |  |  |  | 2 years 2 months 12 days |  |
Performance period |  |  |  | 3 years |  |
Vesting rate based on achievement of TSR relative to the NAREIT retail index (as a percent) |  |  |  | 33.33% |  |
Share based Compensation Arrangement by Share based Payment Award Award Vesting Rights Absolute Total Stockholder Return Metrics Percentage |  |  |  | 66.66% |  |
Number of granted annually shares removed as per amendment |  |  |  | 200,000 |  |
Vested each year for the first two anniversaries after conclusion of performance period |  |  |  |  |  |
Weighted-Average Grant Date Fair Value |  |  |  |  |  |
Vesting rate |  |  |  | 20.00% |  |
Executive Officer | Maximum |  |  |  |  |  |
Weighted-Average Grant Date Fair Value |  |  |  |  |  |
Percentage released stock awards granted |  |  |  | 1.00% |  |
Restricted Common Stock |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation cost | $ |  |  |  | $ 2,239 | $ 3,396 | $ 3,744
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |  |
Nonvested, beginning of period (shares) |  |  |  | 971,846 |  |
Granted (shares) |  |  |  | 1,628,397 |  |
Vested (shares) |  |  |  | (1,052,161) |  |
Forfeited (shares) |  |  |  | (28,476) |  |
Nonvested, end of period (shares) |  |  |  | 1,519,606 | 971,846 |
Weighted-Average Grant Date Fair Value |  |  |  |  |  |
Weighted average grant-date fair value, nonvested, beginning of period (USD per share) | $ / shares |  |  |  | $ 5.16 |  |
Weighted average grant-date fair value, granted (USD per share) | $ / shares |  |  |  | 0.86 | $ 2.20 | $ 4.55
Weighted average grant-date fair value, vested (USD per share) | $ / shares |  |  |  | 2.86 |  |
Weighted average grant-date fair value, forfeited (USD per share) | $ / shares |  |  |  | 4.67 |  |
Weighted average grant-date fair value, nonvested, ending of period (USD per share) | $ / shares |  |  |  | $ 2.15 | $ 5.16 |
Total fair value of shares vested | $ |  |  |  | $ 951 | $ 3,869 | $ 2,189
Number of annual installment for awards to vest | installment |  |  |  | 4 |  |
Shares |  |  |  |  |  |
Granted (shares) |  |  |  | 1,628,397 |  |
Forfeited (shares) |  |  |  | (28,476) |  |
Nonvested, beginning of period (shares) |  |  |  | 971,846 |  |
Nonvested, end of period (shares) |  |  |  | 1,519,606 | 971,846 |
Weighted average grant-date fair value, granted (USD per share) | $ / shares |  |  |  | $ 0.86 | $ 2.20 | $ 4.55
Weighted average grant-date fair value, forfeited (USD per share) | $ / shares |  |  |  | $ 4.67 |  |
Total fair value of shares vested |  |  |  | 1,052,161 |  |
Weighted average grant-date fair value, nonvested, ending of period (USD per share) | $ / shares |  |  |  | $ 2.15 | $ 5.16 |
Granted (shares) |  |  |  | 1,628,397 |  |
Performance Shares |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |  |
Nonvested, beginning of period (shares) |  |  |  | 1,766,580 |  |
Granted (shares) |  |  |  | 3,408,083 | 1,103,537 | 741,977
Vested (shares) |  |  |  | 0 |  |
Forfeited (shares) |  |  |  | (3,408,083) | (78,934) | (663,043)
Nonvested, end of period (shares) |  |  |  | 1,103,537 | 1,766,580 |
Weighted-Average Grant Date Fair Value |  |  |  |  |  |
Weighted average grant-date fair value, nonvested, beginning of period (USD per share) | $ / shares |  |  |  | $ 2.96 |  |
Weighted average grant-date fair value, granted (USD per share) | $ / shares |  |  |  | 0.84 | $ 2.40 | $ 2.63
Weighted average grant-date fair value, forfeited (USD per share) | $ / shares |  |  |  | 0.84 | 2.63 | $ 2.63
Weighted average grant-date fair value, nonvested, ending of period (USD per share) | $ / shares | $ 0.84 | $ 4.74 | $ 4.76 | $ 3.16 | $ 2.96 |
Unrecognized compensation cost related to nonvested stock awards | $ |  |  |  | $ 567 |  |
Performance period |  |  |  | 3 years |  |
Total fair value of shares earned |  |  |  | 0 |  |
Shares |  |  |  |  |  |
Granted (shares) |  |  |  | 3,408,083 | 1,103,537 | 741,977
Forfeited (shares) |  |  |  | (3,408,083) | (78,934) | (663,043)
Nonvested, beginning of period (shares) |  |  |  | 1,766,580 |  |
Nonvested, end of period (shares) |  |  |  | 1,103,537 | 1,766,580 |
Weighted average grant-date fair value, granted (USD per share) | $ / shares |  |  |  | $ 0.84 | $ 2.40 | $ 2.63
Weighted average grant-date fair value, forfeited (USD per share) | $ / shares |  |  |  | $ 0.84 | $ 2.63 | $ 2.63
Shares granted in period classified as liabilities (shares) |  |  |  | 1,247,098 | 566,862 |
Total fair value of shares vested |  |  |  | 0 |  |
Weighted average grant-date fair value, nonvested, ending of period (USD per share) | $ / shares | $ 0.84 | $ 4.74 | $ 4.76 | $ 3.16 | $ 2.96 |
Risk-free interest rate (as a percent) | 1.39% | 2.54% | 2.36% |  |  |
Expected share price volatility (as a percent) | 57.98% | 60.99% | 42.02% |  |  |
Granted (shares) |  |  |  | 3,408,083 | 1,103,537 | 741,977
Performance Shares | Vested each year for the first two anniversaries after conclusion of performance period |  |  |  |  |  |
Weighted-Average Grant Date Fair Value |  |  |  |  |  |
Vesting rate |  |  |  | 20.00% |  |
Performance Shares | Vested at conclusion of performance period |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |
Share-based compensation cost | $ |  |  |  | $ 3,185 | $ 1,564 | $ 1,364
Share-based compensation expense related to cancellation of the 2020 PSUs | $ |  |  |  | $ 2,052 |  |
Weighted-Average Grant Date Fair Value |  |  |  |  |  |
Vesting rate |  |  |  | 60.00% |  |
Performance Shares | Remaining percentage after performance period |  |  |  |  |  |
Weighted-Average Grant Date Fair Value |  |  |  |  |  |
Compensation cost to be recognized over a weighted-average period |  |  |  | 1 year 9 months 18 days |  |
Vesting rate |  |  |  | 40.00% |  |
Performance Shares | Chief Executive Officer |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |  |
Granted (shares) | 2,131,245 | 357,800 | 240,164 |  |  |
Weighted-Average Grant Date Fair Value |  |  |  |  |  |
Weighted average grant-date fair value, nonvested, ending of period (USD per share) | $ / shares | $ 0.88 | $ 2.45 | $ 3.13 |  |  |
Shares |  |  |  |  |  |
Granted (shares) | 2,131,245 | 357,800 | 240,164 |  |  |
Weighted average grant-date fair value, nonvested, ending of period (USD per share) | $ / shares | $ 0.88 | $ 2.45 | $ 3.13 |  |  |
Granted (shares) | 2,131,245 | 357,800 | 240,164 |  |  |
Performance Shares | Officer |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |  |
Granted (shares) | 1,065,463 | 178,875 | 120,064 |  |  |
Weighted-Average Grant Date Fair Value |  |  |  |  |  |
Weighted average grant-date fair value, nonvested, ending of period (USD per share) | $ / shares | $ 0.75 | $ 2.29 | $ 1.63 |  |  |
Shares |  |  |  |  |  |
Granted (shares) | 1,065,463 | 178,875 | 120,064 |  |  |
Weighted average grant-date fair value, nonvested, ending of period (USD per share) | $ / shares | $ 0.75 | $ 2.29 | $ 1.63 |  |  |
Granted (shares) | 1,065,463 | 178,875 | 120,064 |  |  |

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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Percentage of vesting of award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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