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Stockholders' Equity (Details 3) - Employee Stock Option [Member] - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Class of Stock [Line Items] |  |  |
Reserved but unissued shares under the Plan, beginning of year | 882,815 | 723,400 |
Granted - Options to Purchase Common Stock | 127,000 | 171,900 |
Exercised - Options to Purchase Common Stock | 0 | 0 |
Forfeited/Expired/Exchanged - Options to Purchase Common Stock | (15,955) | (12,485) |
Reserved but unissued shares under the Plan, end of year | 993,860 | 882,815 | 723,400
Exercisable - Options to Purchase Common Stock | 754,989 | 547,532 |
Outstanding - Weighted Average Exercise Price | $ 4.98 | $ 5.18 |
Granted - Weighted Average Exercise Price | 3.69 | 4.22 |
Exercised - Weighted Average Exercise Price | 0 | 0 |
Forfeited/Expired/Exchanged - Weighted Average Exercise Price | 5.15 | 6.17 |
Outstanding - Weighted Average Exercise Price | 4.81 | 4.98 | $ 5.18
Exercisable - Weighted Average Exercise Price | $ 4.98 | $ 4.91 |
Granted - Weighted Average Remaining Contractual Life (in years) | 9 years 5 months 23 days | 9 years 3 months 4 days |
Exercised - Weighted Average Remaining Contractual Life (in years) | 0 years | 0 years |
Forfeited/Expired/Exchanged - Weighted Average Remaining Contractual Life (in years) | 0 years | 0 years |
Outstanding - Weighted Average Remaining Contractual Life (in years) | 6 years 11 months 8 days | 7 years 6 months 4 days | 8 years 1 month 6 days
Exercisable - Weighted Average Remaining Contractual Life (in years) | 6 years 3 months 25 days | 6 years 10 months 6 days |

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- Definition Weighted average remaining contractual term for option awards forfeited or expired or exchanged, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Weighted average remaining contractual term for options granted during the period. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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