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Consolidated Balance Sheets Parenthetical - $ / shares | Dec. 31, 2018 | Dec. 31, 2017
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Statement of Financial Position [Abstract] |  |
Common stock, par value (in dollars per share) | $ 0.001 | $ 0.001
Common stock, shares authorized (in shares) | 50,000,000 | 200,000,000
Common stock, shares outstanding (in shares) | 15,098,837 | 8,895,094

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