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Shares Issued through Equity Offering Program (Details) - USD ($) |  |  | 9 Months Ended
--- | --- | --- | ---
Oct. 05, 2016 | Mar. 20, 2014 | Sep. 30, 2016
Shares issued through equity offering program |  |  |
Maximum aggregate sales price of shares to be sold under an Equity Offering Sales Agreement |  | $ 38,360,000 |
Number of shares sold (in shares) |  |  | 607,701
Proceeds from sale of shares, net of commission and before offering costs |  |  | $ 14,408,000
Payment of commissions on sale of shares |  |  | 146,000
Payment of offering costs on sale of shares. |  |  | $ 111,000
Subsequent event |  |  |
Shares issued through equity offering program |  |  |
Number of shares sold (in shares) | 11,057 |  |
Proceeds from sale of shares, net of commission and before offering costs | $ 268,000 |  |
Payment of commissions on sale of shares | $ 3,000 |  |

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