Stockholders’ Equity- Summary of Estimated Net Asset Value Per Share as of Effective Date (Details)	Dec. 31, 2017
July 1, 2018 and June 30, 2019 [Member]
Share Redemption Program, Redemption Price, Percentage of Share Price	92.50%
July 1, 2019 and June 30, 2020 [Member]
Share Redemption Program, Redemption Price, Percentage of Share Price	95.00%
July 1, 2020 and June 30, 2021 [Member]
Share Redemption Program, Redemption Price, Percentage of Share Price	97.50%
Thereafter [Member]
Share Redemption Program, Redemption Price, Percentage of Share Price	100.00%