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Shares Issued through Equity Offering Program (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2017
Shares Issued through Equity Offering Program |  |  |
Number of shares sold (in shares) | 4,197 | 103,196 | 135,196
Proceeds from sale of shares, net of commission and before offering costs | $ 102,000 | $ 2,461,000 | $ 3,252,000
Payment of commissions on sale of shares | $ 1,000 | 25,000 | 33,000
Payment of offering costs on sale of shares. |  | $ 43,000 | $ 185,000

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