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Equity - Narrative (Details) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 20, 2017 USD ($) | Mar. 31, 2019 USD ($) vote $ / shares shares | Mar. 31, 2018 $ / shares shares | Mar. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($)
Class of Stock [Line Items] |  |  |  |  |
Number of votes (in votes) | vote |  | 1 |  |  |
Percent of organizational and offering costs limit (percent) |  | 15.00% |  |  |
Days required for reimbursement of excess amounts |  | 60 days |  |  |
Organizational costs as a percentage of gross offering proceeds (percent) |  | 37.10% |  |  |
Due to related parties |  | $ 12,168,000 |  | $ 12,168,000 | $ 19,048,000
Written notice needed to amend or terminate the DRP |  | 10 days |  |  |
Common stock subject to redemption |  | $ 37,274,000 |  | $ 37,274,000 | 37,357,000
Stock Redeemed or Called During Period, Shares | shares |  | 3,297,240 |  |  |
Stock Redeemed or Called During Period, Value |  |  |  |  | 6,538,000
Follow-on Offering |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Offering amount in sales of shares | $ 2,200,000,000 |  |  |  |
Minimum holding period for redemption of stock | 1 year |  |  |  |
Primary Offering |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Offering amount in sales of shares | $ 2,000,000,000 |  |  |  |
Distribution Reinvestment Plan |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Common stock of the Company pursuant to the distribution reinvestment plan (in shares) | $ 200,000,000 |  |  |  |
Share Redemption Program |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Stock Redeemed or Called During Period, Shares | shares |  | 0 | 217,088 |  |
Weighted average price per share (in dollars per share) | $ / shares |  | $ 0.00 | $ 9.15 |  |
Share Redemption Program | IPO |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Minimum holding period for redemption of stock |  | 4 years |  |  |
New Share Redemption Program |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Minimum holding period for redemption of stock |  | 1 year |  |  |
Redemption price as percentage of Net Asset Value of outstanding shares (percent) |  | 100.00% |  | 100.00% |
Minimum ownership percentage under share redemption program (percent) |  | $ 2,500 |  | $ 2,500 |
Quarterly redemption cap as percentage of Net Asset Value of outstanding shares (percent) |  | 5.00% |  |  |
Common stock subject to redemption |  | $ 37,300,000 |  | $ 37,300,000 |
Stock Redeemed or Called During Period, Shares | shares |  | 0 | 0 | 1,199,463.98 |
Weighted average price per share (in dollars per share) | $ / shares |  |  |  | $ 9.62 |
Written notice required to modify or suspend program |  | 30 days |  |  |
New Share Redemption Program | IPO |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Minimum holding period for redemption of stock |  | 4 years |  |  |
Organizational and Offering Costs Incurred | IPO |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Cumulative organizational costs |  | $ 3,700,000 |  | $ 3,700,000 |
Proceeds from offering |  | 10,000,000 |  |  |
Organizational and offering costs advanced by the Advisor |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Cumulative organizational costs |  | 536,000 |  | 536,000 |
Due to related parties |  | 1,316,000 |  | 1,316,000 | $ 1,312,000
Due to Affiliates | Organizational and offering costs advanced by the Advisor |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Due from related parties |  | 900,000 |  | 900,000 |
Other Assets | Organizational and offering costs advanced by the Advisor |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Due from related parties |  | 1,300,000 |  | 1,300,000 |
Pro forma | Organizational and offering costs advanced by the Advisor |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Due to related parties |  | 1,500,000 |  | 1,500,000 |
Due from related parties |  | $ 2,200,000 |  | 2,200,000 |
Common Stock | Share Redemption Program |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Stock Redeemed or Called During Period, Value |  |  |  | $ 11,500,000 |

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