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Significant Accounting Policies (Details) |  |  |  | 1 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 14, 2019 USD ($) shares | Aug. 01, 2019 USD ($) $ / shares shares | Jul. 01, 2019 USD ($) | Jul. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) Property $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Jan. 01, 2019 USD ($)
Significant Account Policies [Line Items] |  |  |  |  |  |  |
Cash equivalents |  |  |  |  | $ 5,100,000 | $ 5,800,000 |
Restricted cash |  |  |  |  | $ 6,600,000 | $ 4,000,000 |
Number of real estate properties held for sale | Property |  |  |  |  | 4 |  |
Asset impairment charge |  |  |  |  | $ 0 |  |
Preferred stock dividend rate percentage |  |  |  |  | 14.00% |  |
Preferred stock shares outstanding (in shares) | shares |  |  |  |  | 16,000 | 16,900 |
Right-of-use assets |  |  |  |  | $ 661,000 |  |
Lease liabilities |  |  |  |  | 613,074 |  |
Lease liabilities, gross |  |  |  |  | 661,000 |  |
Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |  |
Significant Account Policies [Line Items] |  |  |  |  |  |  |
Right-of-use assets |  |  |  |  | 147,000 |  | $ 514,000
Lease liabilities |  |  |  |  | $ 147,000 |  | $ 514,000
Redeemable Convertible Preferred Stock Series B [Member] |  |  |  |  |  |  |
Significant Account Policies [Line Items] |  |  |  |  |  |  |
Number of shares redeemed | shares |  |  |  |  | 900 | 13,800 |
Redeemable preferred stock |  |  |  |  | $ 16,000,000 | $ 16,900,000 |
Preferred stock liquidation preference value (in dollars per share) | $ / shares |  |  |  |  | $ 1,000 | $ 1,000 |
Number of shares redeemed |  |  |  |  | $ 900,000 | $ 13,800,000 |
Preferred stock shares outstanding (in shares) | shares |  |  |  |  | 16,000 | 16,900 |
Subsequent Event [Member] | Redeemable Convertible Preferred Stock Series B [Member] |  |  |  |  |  |  |
Significant Account Policies [Line Items] |  |  |  |  |  |  |
Number of shares redeemed | shares | 2,000 | 16,000 |  |  |  |  |
Redeemable preferred stock |  | $ 16,000,000 |  |  |  |  |
Preferred stock dividend rate percentage |  | 24.00% |  |  |  |  |
Preferred stock liquidation preference value (in dollars per share) | $ / shares |  | $ 1,000 |  |  |  |  |
Number of shares redeemed | $ 2,000,000 |  |  |  |  |  |
Preferred stock shares outstanding (in shares) | shares | 14,000 |  |  |  |  |  |
Genesis Plaza [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Significant Account Policies [Line Items] |  |  |  |  |  |  |
Sale of Interest in property |  |  | 43.00% |  |  |  |
Sale of Property |  |  | $ 5,600,000 |  |  |  |
Sale of real estate property, debt assumed |  |  | 2,900,000 |  |  |  |
Proceeds from sale of property |  |  | $ 2,900,000 |  |  |  |
The Presidio [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Significant Account Policies [Line Items] |  |  |  |  |  |  |
Proceeds from sale of property |  |  |  | $ 12,300,000 |  |  |
Gain recognized on sale of property |  |  |  | $ 4,500,000 |  |  |

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