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Stockholder's Equity Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based payment | $ 1,112 | $ 860 | $ 3,019 | $ 2,452
Stock options exercised (in shares) | 4,000 |  | 18,000 |
Stock options granted (in shares) | 20,000 |  | 630,000 |
Stock options expired (in shares) | 28,000 |  | 127,000 |
Stock options exercised, delivered to company (in shares) |  |  | $ 144 |
Stock options granted, weighted average price (in USD per share) |  |  | $ 3.09 |
Stock options outstanding (in shares) | 1,761,000 |  | 1,761,000 |
Stock options outstanding, weighted average exercise price (in USD per share) | $ 9.92 |  | $ 9.92 |
Stock options exercisable (in shares) | 542,000 |  | 542,000 |
Exercisable stock options, weighted average exercise price (in USD per share) | $ 10.28 |  | $ 10.28 |
Restricted stock expired (in shares) | 0 |  | 0 |
Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based payment | $ 1,093 | 849 | $ 2,970 | 2,417
Unrecognized compensation expense | 3,351 |  | $ 3,351 |
Weighted-average period of recognition |  |  | 2 years 10 months 17 days |
Restricted Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation expense | $ 4,163 |  | $ 4,163 |
Weighted-average period of recognition |  |  | 2 years 3 months 12 days |
Restricted stock (in shares) | 45,000 |  | 322,000 |
Restricted stock, weighted average price (in USD per share) | $ 8.90 |  | $ 9.66 |
Restricted stock award, forfeitures (in shares) | 11,000 |  | 31,000 |
Restricted stock vested (in shares) | 30,000 |  | 287,000 |
Restricted stock outstanding (in shares) | 531,000 |  | 531,000 |
Performance-Based or Market-Based Shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Restricted stock outstanding (in shares) | 0 |  | 0 |
Unvested outstanding options (in shares) | 0 |  | 0 |
ESPP Plan | Employee Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based payment | $ 19 | $ 11 | $ 49 | $ 35
Percentage of Company's common stock share price | 85.00% |  | 85.00% |
Stock options issued ESPP (in shares) | 22,000 | 17,000 | 45,000 | 17,000

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