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Warrants Outstanding and Exercisable (Details) shares in Thousands | Dec. 31, 2016 $ / shares shares | Dec. 31, 2015 $ / shares | Dec. 31, 2014 $ / shares
--- | --- | --- | ---
Warrant, exercise price | $ 2.23 | $ 3.34 | $ 3.08
Warrants, Outstanding as of end of period | shares | 3,761 |  |
Warrants outstanding, weighted average exercise price | 2.23 |  |
Warrants, Exercisable at end of period | shares | 3,761 |  |
Warrants exercisable, weighted average exercise price | $ 2.23 |  |
$1.76 - $3.08 |  |  |
Warrant exercise, mimimum | 1.76 |  |
Warrant exercise price, maximum | 3.08 |  |
Warrants, Outstanding as of end of period | shares | 3,761 |  |
Warrants outstanding, weighted average remaining contractual life, years | 1.38 |  |
Warrants outstanding, weighted average exercise price | 2.23 |  |
Warrants, Exercisable at end of period | shares | 3,761 |  |
Warrants exercisable, weighted average exercise price | $ 2.23 |  |

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