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Warrants Outstanding and Exercisable (Details) shares in Thousands | Dec. 31, 2018 $ / shares shares | Dec. 31, 2016 $ / shares
--- | --- | ---
Warrant, exercise price | $ 2.47 | $ 2.23
Warrants, Outstanding as of end of period | shares | 1,973 |
Warrants outstanding, weighted average remaining contractual life, years | 0.21 |
Warrants outstanding, weighted average exercise price | 2.47 |
Warrants, Exercisable at end of period | shares | 1,973 |
Warrants exercisable, weighted average exercise price | $ 2.47 |

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