| Schedule of dilutive securities excluded from computations of diluted weighted average shares outstanding |
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Three Months Ended
March 31,
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2018
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2017
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Convertible preferred stock outstanding
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12,111,706
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12,111,706
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Convertible preferred stock warrants
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657,361
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423,784
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Common stock options outstanding
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1,975,700
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1,692,859
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14,744,767
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14,228,349
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