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Stockholder's Equity (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Allocated share-based compensation expense | $ 805,000 | $ 874,000
Stock options exercised (in shares) | 0 |
Stock options granted (in shares) | 0 |
Stock options expired (in shares) | 95,000 |
Stock options outstanding (in shares) | 1,529,000 |
Stock options outstanding, weighted average exercise price (in USD per share) | $ 9.68 |
Stock options exercisable (in shares) | 370,000 |
Exercisable stock options, weighted average exercise price (in US per share) | $ 9.60 |
Restricted stock surrendered (in shares) | 0 |
Stock options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Allocated share-based compensation expense | $ 789,000 | 860,000
Unrecognized compensation expense | $ 2,724,000 |
Weighted-average period of recognition | 2 years 4 months 28 days |
Restricted stock |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Unrecognized compensation expense | $ 2,869,000 |
Weighted-average period of recognition | 2 years 3 months 14 days |
Restricted stock options (in shares) | 0 |
Restricted stock award, forfeitures | $ 0 |
Restricted stock vested (in shares) | 102,000 |
Restricted stock outstanding, nonvested (in shares) | 397,000 |
Employee Stock | ESPP Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Allocated share-based compensation expense | $ 16,000 | $ 14,000
Restricted stock options (in shares) | 20,000 | 23,000
Percentage of Company's common stock share price | 85.00% |

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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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