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Share-Based Compensation - Summary (Details) |  |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
Feb. 10, 2020 $ / shares shares | Feb. 11, 2019 $ / shares shares | Feb. 12, 2018 $ / shares | Jun. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) installment $ / shares shares | Jun. 30, 2019 USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |  |  |  |  |
Number of shares authorized (shares) |  |  |  | 10,400,000 |  | 10,400,000 |
Share-based compensation cost capitalized as part of real estate assets | $ |  |  |  | $ 5,000 | $ 27,000 | $ 12,000 | $ 41,000
Weighted-Average Grant Date Fair Value |  |  |  |  |  |  |
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 amendement |  |  |  | 200,000 |  | 200,000 |
Unrecognized compensation cost related to nonvested stock awards | $ |  |  |  | $ 2,709,000 |  | $ 2,709,000 |
Compensation cost to be recognized over a weighted-average period |  |  |  |  |  | 2 years 4 months 24 days |
Shares |  |  |  |  |  |  |
Performance period |  |  |  |  |  | 3 years |
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 expense | $ |  |  |  | $ 361,000 | 546,000 | $ 1,505,000 | 2,259,000
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) |  |  |  |  |  | (1,051,783) |
Forfeited (shares) |  |  |  |  |  | (24,911) |
Nonvested, end of period (shares) |  |  |  | 1,523,549 |  | 1,523,549 |
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 |
Weighted average grant-date fair value, vested (USD per share) | $ / shares |  |  |  |  |  | 2.86 |
Weighted average grant-date fair value, forfeited (USD per share) | $ / shares |  |  |  |  |  | 4.64 |
Weighted average grant-date fair value, nonvested, ending of period (USD per share) | $ / shares |  |  |  | $ 2.16 |  | $ 2.16 |
Number of annual installment for awards to vest | installment |  |  |  |  |  | 4 |
Shares |  |  |  |  |  |  |
Nonvested, beginning of period (shares) |  |  |  |  |  | 971,846 |
Granted (shares) |  |  |  |  |  | 1,628,397 |
Nonvested, end of period (shares) |  |  |  | 1,523,549 |  | 1,523,549 |
Total fair value of shares vested |  |  |  |  |  | 1,051,783 |
Weighted average grant-date fair value, nonvested, ending of period (USD per share) | $ / shares |  |  |  | $ 2.16 |  | $ 2.16 |
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 |
Vested (shares) |  |  |  |  |  | 0 |
Nonvested, end of period (shares) |  |  |  | 5,174,663 |  | 5,174,663 |
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 |
Weighted average grant-date fair value, nonvested, ending of period (USD per share) | $ / shares | $ 0.84 | $ 4.74 | $ 4.76 | $ 1.56 |  | $ 1.56 |
Performance period |  |  |  |  |  | 3 years |
Unrecognized compensation cost related to nonvested stock awards | $ |  |  |  | $ 3,597,000 |  | $ 3,597,000 |
Shares |  |  |  |  |  |  |
Nonvested, beginning of period (shares) |  |  |  |  |  | 1,766,580 |
Granted (shares) |  |  |  |  |  | 3,408,083 |
Nonvested, end of period (shares) |  |  |  | 5,174,663 |  | 5,174,663 |
Shares granted in period classified as liabilities (shares) |  |  |  |  |  | 211,375 |
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 | $ 1.56 |  | $ 1.56 |
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% |  |  |  |
Performance period |  |  |  |  |  | 3 years |
Granted (shares) |  |  |  |  |  | 3,408,083 |
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 expense | $ |  |  |  | $ (60,000) | $ 443,000 | $ 418,000 | $ 869,000
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 |  |  |  |  |  | 4 years 2 months 12 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 |  |  |  |  |
Weighted-Average Grant Date Fair Value |  |  |  |  |  |  |
Weighted average grant-date fair value, nonvested, ending of period (USD per share) | $ / shares | $ 0.88 | $ 2.45 |  |  |  |  |
Shares |  |  |  |  |  |  |
Granted (shares) | 2,131,245 | 357,800 |  |  |  |  |
Weighted average grant-date fair value, nonvested, ending of period (USD per share) | $ / shares | $ 0.88 | $ 2.45 |  |  |  |  |
Granted (shares) | 2,131,245 | 357,800 |  |  |  |  |
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 |  |  |  |  |
Weighted-Average Grant Date Fair Value |  |  |  |  |  |  |
Weighted average grant-date fair value, nonvested, ending of period (USD per share) | $ / shares | $ 0.75 | $ 2.29 |  |  |  |  |
Shares |  |  |  |  |  |  |
Granted (shares) | 1,065,463 | 178,875 |  |  |  |  |
Weighted average grant-date fair value, nonvested, ending of period (USD per share) | $ / shares | $ 0.75 | $ 2.29 |  |  |  |  |
Granted (shares) | 1,065,463 | 178,875 |  |  |  |  |

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- Definition Amount of cost not yet recognized for nonvested 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting 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 (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting 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 (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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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