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Stock Options and Stock-Based Compensation - Shares of Restricted Stock Granted under 2010 Plan (Details) - shares | 6 Months Ended | 12 Months Ended
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Jun. 30, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares | 86,336 |  |  |  |
Period One |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting Term (In Years) | 2 years |  |  |  |
Plan 2010 | Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares | 66,644 |  |  |  |
Remaining Term (In Years) | 2 years 3 months 18 days |  |  |  |
Plan 2010 | Five Years | Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting Term (In Years) | 5 years | 5 years | 5 years | 5 years | 5 years
Shares | 11,496 | 10,422 | 14,776 | 7,996 | 5,500
Remaining Term (In Years) | 4 years 7 months 6 days | 3 years 7 months 6 days | 2 years 7 months 6 days | 1 year 8 months 12 days | 7 months 6 days
Plan 2010 | Four Years | Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting Term (In Years) |  |  |  | 4 years |
Shares |  |  |  | 2,704 |
Remaining Term (In Years) |  |  |  | 8 months 12 days |
Plan 2010 | Three Years | Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting Term (In Years) |  |  | 3 years |  |
Shares |  |  | 3,808 |  |
Remaining Term (In Years) |  |  | 7 months 6 days |  |
Plan 2010 | Two Years | Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting Term (In Years) |  | 2 years |  |  |
Shares |  | 7,786 |  |  |
Remaining Term (In Years) |  | 7 months 6 days |  |  |
Plan 2010 | Period One | Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting Term (In Years) | 1 year |  |  |  |
Shares | 2,156 |  |  |  |
Remaining Term (In Years) | 7 months 6 days |  |  |  |

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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=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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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