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Share-Based Compensation - Summary (Details)
3 Months Ended
Feb. 10, 2020
$ / shares
shares
Feb. 11, 2019
$ / shares
shares
Feb. 12, 2018
$ / shares
Mar. 31, 2020
USD ($)
installment
$ / shares
shares
Mar. 31, 2019
USD ($)
Mar. 31, 2020
USD ($)
$ / 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 | $       $ 7,000 $ 14,000  
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
Unrecognized compensation cost related to nonvested stock awards | $           $ 3,165,000
Compensation cost to be recognized over a weighted-average period       2 years 7 months 6 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 | $       $ 1,144,000 1,713,000  
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)       (4,852)    
Nonvested, end of period (shares)       1,543,608    
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       5.81    
Weighted average grant-date fair value, nonvested, ending of period (USD per share) | $ / shares       $ 2.19    
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)       1,543,608    
Total fair value of shares vested       1,051,783    
Weighted average grant-date fair value, nonvested, ending of period (USD per share) | | $ / shares       $ 2.19   $ 2.19
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    
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    
Performance period       3 years    
Unrecognized compensation cost related to nonvested stock awards | $           $ 4,678,000
Shares            
Nonvested, beginning of period (shares)       1,766,580    
Granted (shares)       3,408,083    
Nonvested, end of period (shares)       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 | $       $ 478,000 $ 426,000  
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 1 month 6 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