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Stock-Based Compensation - Shares of Restricted Stock Granted under 2010 Plan (Details) - Plan 2010 - Restricted Stock - shares | 6 Months Ended | 12 Months Ended
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Jun. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares | 75,804 |  |  |  |
Remaining Term (In Years) | 1 year 9 months 18 days |  |  |  |
2015 | Five Years |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting Term (In Years) |  |  |  |  | 5 years
Shares | 12,023 |  |  |  |
Remaining Term (In Years) |  |  |  |  | 18 days
2016 | Five Years |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting Term (In Years) |  |  |  | 5 years |
Shares | 15,015 |  |  |  |
Remaining Term (In Years) |  |  |  | 1 year 7 months 6 days |
2017 | Five Years |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting Term (In Years) |  |  | 5 years |  |
Shares | 9,972 |  |  |  |
Remaining Term (In Years) |  |  | 2 years 7 months 6 days |  |
2017 | Three Years |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting Term (In Years) |  |  | 3 years |  |
Shares | 4,902 |  |  |  |
Remaining Term (In Years) |  |  | 18 days |  |
2018 | Five Years |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting Term (In Years) |  | 5 years |  |  |
Shares | 9,655 |  |  |  |
Remaining Term (In Years) |  | 3 years 6 months |  |  |
2018 | Three Years |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting Term (In Years) |  | 3 years |  |  |
Shares | 2,150 |  |  |  |
Remaining Term (In Years) |  | 1 year 7 months 6 days |  |  |
2018 | Two Years |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting Term (In Years) |  | 2 years |  |  |
Shares | 932 |  |  |  |
Remaining Term (In Years) |  | 15 days |  |  |
2018 | Four Years |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting Term (In Years) |  | 4 years |  |  |
Shares | 2,068 |  |  |  |
Remaining Term (In Years) |  | 2 years 6 months |  |  |
2019 | Three Years |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting Term (In Years) | 3 years |  |  |  |
Shares | 16,254 |  |  |  |
Remaining Term (In Years) | 2 years 7 months 6 days |  |  |  |
2019 | One Year |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting Term (In Years) | 1 year |  |  |  |
Shares | 1,349 |  |  |  |
Remaining Term (In Years) | 18 days |  |  |  |
2019 | Two Years |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vesting Term (In Years) | 2 years |  |  |  |
Shares | 1,484 |  |  |  |
Remaining Term (In Years) | 1 year 7 months 6 days |  |  |  |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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