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Stock-Based Compensation (Details Textual) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Oct. 31, 2014 | Mar. 31, 2018 | Dec. 31, 2017
Stock-Based Compensation (Textual) |  |  |
Options outstanding |  | 7,665,500 | 7,190,500
Stock option expense recognize period |  | 2 years 3 months 19 days |
Pre-vesting forfeiture rate |  | 10.00% |
Unrecognized compensation expense |  | $ 409 |
2006 Equity Incentive Plan [Member] |  |  |
Stock-Based Compensation (Textual) |  |  |
Shares reserved for company's employees |  | 1,720,000 |
Options outstanding |  | 365,500 |
2006 Non-Employee Director Stock Option Plan [Member] |  |  |
Stock-Based Compensation (Textual) |  |  |
Shares reserved for company's employees |  | 700,000 |
2014 Stock Incentive Plan [Member] |  |  |
Stock-Based Compensation (Textual) |  |  |
Shares reserved for company's employees | 7,390,355 |  |

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- Definition Share Based Compensation Arrangement by Share Based Payment Award pre-vesting forfeiture rate . + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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 -Subparagraph (i) -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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