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Common Stock Incentive, Stock Purchase Plans and Other Compensation Plans - Narrative (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 37 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 31, 2016 | Aug. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 13, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Aggregate intrinsic value of options exercisable |  |  | $ 30,000 |  | $ 30,000 |  | $ 30,000 |
Remaining share-based compensation expense |  |  | 483,000 |  | $ 483,000 |  | 483,000 |
Weighted average recognition period on remaining share-based compensation expense |  |  |  |  | 2 years 3 months 10 days |  |  |
Common stock repurchased - value |  |  |  |  | $ 3,000 |  |  |
Employee Stock Option |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Compensation costs recognized related to stock options |  |  | 67,000 | $ 18,000 | $ 134,000 | $ 37,000 |  |
Restricted Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Weighted average recognition period on remaining share-based compensation expense |  |  |  |  | 1 year 1 month 27 days |  |  |
Compensation costs recognized related to stock options |  |  | 54,000 | $ 74,000 | $ 108,000 | $ 917,000 |  |
Remaining share-based compensation expense |  |  | $ 139,000 |  | $ 139,000 |  | $ 139,000 |
Securities Repurchase Program |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common stock repurchase - authorized amount |  |  |  |  |  |  |  | $ 5,000,000
Share repurchases (in shares) | 120,370 | 38,400 |  |  | 0 |  | 37,727 |
Common stock repurchased - value | $ 975,000 | $ 308,000 |  |  |  |  | $ 492,000 |
Share repurchased, average cost (in dollars per share) | $ 8.10 | $ 8.00 |  |  |  |  | $ 13.05 |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(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 Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + 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 Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. + 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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