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Stockholder's Equity Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based payment | $ 1,033 | $ 739 | $ 1,907 | $ 1,592
Stock options exercised (in shares) | 7,000 |  | 14,000 |
Stock options granted (in shares) | 610,000 |  | 610,000 |
Stock options expired (in shares) | 97,000 |  | 99,000 |
Stock options exercised, delivered to company (in shares) |  |  | $ 109 |
Stock options granted, weighted average price (in USD per share) |  |  | $ 3.09 |
Stock options outstanding (in shares) |  | 1,774,000 |  | 1,774,000
Stock options outstanding, weighted average exercise price (in USD per share) |  | $ 9.92 |  | $ 9.92
Stock options exercisable (in shares) |  | 549,000 |  | 549,000
Exercisable stock options, weighted average exercise price (in USD per share) |  | $ 10.27 |  | $ 10.27
Restricted stock expired (in shares) | 0 |  | 0 |
Stock options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based payment | $ 1,017 | $ 725 | $ 1,877 | $ 1,568
Unrecognized compensation expense | 3,676 |  | $ 3,676 |
Weighted-average period of recognition |  |  | 3 years 1 month 6 days |
Restricted stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized compensation expense | $ 4,654 |  | $ 4,654 |
Weighted-average period of recognition |  |  | 2 years 4 months 40 days |
Restricted stock (in shares) | 199,000 |  | 277,000 |
Restricted stock, weighted average price (in USD per share) | $ 9.46 |  | $ 9.78 |
Restricted stock award, forfeitures (in shares) | 20,000 |  | 20,000 |
Restricted stock vested (in shares) | 63,000 |  | 257,000 |
Restricted stock outstanding (in shares) | 526,000 |  | 526,000 |
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 | $ 16 | $ 14 | $ 30 | $ 24
Percentage of Company's common stock share price | 85.00% |  | 85.00% |
Stock options issued ESPP (in shares) | 0 | 0 | 23,000 | 0

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