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Warrant derivative liability (Warrant activity) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified |
12 Months Ended | |||||||
|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2014
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Dec. 31, 2013
|
Dec. 31, 2012
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Mar. 31, 2008
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| Changes in warrant activity | ||||||||
| Change in fair value of warrant derivative liability | $ 19 | $ (3) | $ 75 | |||||
| Public Warrants [Member] | ||||||||
| Changes in warrant activity | ||||||||
| Warrants outstanding | 598,850 | 4,239,300 | ||||||
| Expired | (598,850) | |||||||
| Warrants outstanding | 598,850 | 4,239,300 | ||||||
| Warrants fair value | 12 | |||||||
| Unit Options [Member] | ||||||||
| Changes in warrant activity | ||||||||
| Warrants outstanding | 280,000 | [1] | ||||||
| Expired | (280,000) | [1] | ||||||
| Warrants outstanding | [1] | 280,000 | [1] | |||||
| Warrants fair value | 6 | |||||||
| Underwriter Warrants [Member] | ||||||||
| Changes in warrant activity | ||||||||
| Warrants outstanding | 13,571 | |||||||
| Expired | ||||||||
| Warrants outstanding | 13,571 | 13,571 | ||||||
| Warrants fair value | $ 2 | $ 3 | ||||||
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