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Warrants Outstanding and Exercisable (Details) shares in Thousands | Dec. 31, 2015 $ / shares shares | Dec. 31, 2014 $ / shares | Mar. 31, 2014 $ / shares | Dec. 31, 2013 $ / shares | Dec. 31, 2012 $ / shares
--- | --- | --- | --- | --- | ---
Warrant, exercise price | $ 3.34 | $ 3.08 | $ 2.47 | $ 3.07 | $ 7.28
Warrants, Outstanding as of end of period | shares | 5,039 |  |  |  |
Warrants outstanding, weighted average exercise price | 3.34 |  |  |  |
Warrants, Exercisable at end of period | shares | 5,039 |  |  |  |
Warrants exercisable, weighted average exercise price | $ 3.34 |  |  |  |
$2.01 - $3.08 |  |  |  |  |
Warrant exercise, mimimum | 2.01 |  |  |  |
Warrant exercise price, maximum | 3.08 |  |  |  |
Warrants, Outstanding as of end of period | shares | 3,761 |  |  |  |
Warrants outstanding, weighted average remaining contractual life, years | 2.39 |  |  |  |
Warrants outstanding, weighted average exercise price | 2.36 |  |  |  |
Warrants, Exercisable at end of period | shares | 3,761 |  |  |  |
Warrants exercisable, weighted average exercise price | $ 2.36 |  |  |  |
$6.24 - $10.24 |  |  |  |  |
Warrant exercise, mimimum | 6.24 |  |  |  |
Warrant exercise price, maximum | 10.24 |  |  |  |
Warrants, Outstanding as of end of period | shares | 1,278 |  |  |  |
Warrants outstanding, weighted average remaining contractual life, years | 0.88 |  |  |  |
Warrants outstanding, weighted average exercise price | 6.24 |  |  |  |
Warrants, Exercisable at end of period | shares | 1,278 |  |  |  |
Warrants exercisable, weighted average exercise price | $ 6.24 |  |  |  |

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