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Stockholders' Equity (Details) - USD ($) |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 06, 2017 | Mar. 31, 2015 | Dec. 31, 2015 | Nov. 10, 2010
Stockholders' Equity |  |  |  |
Shares of common stock issued | 1,325,000 | 1,437,000 |  |
Sale of Stock, Price Per Share | $ 1.70 |  |  |
Net proceeds from issuance of common stock | $ 1,989,000 | $ 21,400,000 | $ 21,368,000 |
Shares of common stock available by warrant | 0.5 |  |  |
Warrants available to purchase | 662,500 |  |  |
Exercise price of warrants | $ 2.35 |  |  | $ 4.80

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