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Stockholders' Equity (Details) |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 10, 2010 item $ / shares shares | Jul. 31, 2017 USD ($) $ / shares shares | Mar. 31, 2015 USD ($) item shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Stockholders' Equity |  |  |  |  |  |
Shares of common stock issued |  | 1,325,000 | 1,437,000 |  |  |
Net proceeds from issuance of common stock | $ |  | $ 1,987,000 | $ 21,400,000 | $ 1,967,000 | $ 364,000 | $ 23,140,000
Number of executive officers | item |  |  | 2 |  |  |
Shares purchased by executive officers |  |  | 40,625 |  |  |
Sale of Stock, Price Per Share | $ / shares |  | $ 1.70 |  |  |  |
Shares of common stock available by warrant |  | 0.5 |  |  |  |
Warrants available to purchase |  | 662,500 |  |  |  |
Exercise price of warrants | $ / shares | $ 4.80 | $ 2.35 |  |  |  |
Number of preferred share purchase rights declared as dividend for each outstanding share of common stock | item | 1 |  |  |  |  |
Number of shares of Series AA Preferred Stock that a registered holder of right is entitled to purchase | 0.001 |  |  |  |  |
Percentage of the company's common stock acquired by a third party upon which the rights become exercisable | 15.00% |  |  |  |  |
Minimum percentage of the company's common stock that must receive a tender offer from a third party upon which the rights become exercisable | 15.00% |  |  |  |  |

X
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- Definition Represents the minimum percentage of the entity's common stock that must receive a tender offer to purchase by a third party upon which the rights become exercisable. + References No definition available. + Details
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- Definition Represents the percentage of the entity's common stock acquired by a third party upon which the rights become exercisable. + References No definition available. + Details
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- Definition Represents the number of shares of preferred stock that the holder of each preferred share purchase right is entitled to purchase, if the rights become exercisable. + References No definition available. + Details
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- Definition Represents the number of preferred share purchase rights declared as dividend for each outstanding share of common stock. + References No definition available. + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition The number of warrants or rights which entitle the entity to receive future services in exchange for the unvested, forfeitable warrants or rights. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775 + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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