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Warrants (Details) | 3 Months Ended
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Mar. 31, 2019 $ / shares shares
Warrants and Rights [Abstract] |  |
Total Warrants (in shares) | shares | 2,126,813 |
Expiration Date, April 30, 2019 [Member] |  |
Warrants and Rights [Abstract] |  |
Issue Date | Oct. 31, 2013 | [1]
Expiration date | Apr. 30, 2019 | [1]
Total Warrants (in shares) | shares | 137,143 | [1]
Exercise price (in dollars per share) | $ / shares | $ 3.75 | [1]
Expiration Date, July 24, 2019 [Member] |  |
Warrants and Rights [Abstract] |  |
Issue Date | Jul. 24, 2014 |
Expiration date | Jul. 24, 2019 |
Total Warrants (in shares) | shares | 1,239,769 |
Expiration Date, July 24, 2019 [Member] | Minimum [Member] |  |
Warrants and Rights [Abstract] |  |
Exercise price (in dollars per share) | $ / shares | $ 3.75 |
Expiration Date, July 24, 2019 [Member] | Maximum [Member] |  |
Warrants and Rights [Abstract] |  |
Exercise price (in dollars per share) | $ / shares | $ 12.25 |
Expiration Date, June 22, 2020 [Member] |  |
Warrants and Rights [Abstract] |  |
Issue Date | Jun. 22, 2015 |
Expiration date | Jun. 22, 2020 |
Total Warrants (in shares) | shares | 600,000 |
Exercise price (in dollars per share) | $ / shares | $ 3.75 |
Expiration Date, December 30, 2020 [Member] |  |
Warrants and Rights [Abstract] |  |
Issue Date | Dec. 30, 2015 |
Expiration date | Dec. 30, 2020 |
Total Warrants (in shares) | shares | 130,089 |
Exercise price (in dollars per share) | $ / shares | $ 5.65 |
Expiration Date, January 29, 2021 [Member] |  |
Warrants and Rights [Abstract] |  |
Issue Date | Jan. 29, 2016 |
Expiration date | Jan. 29, 2021 |
Total Warrants (in shares) | shares | 19,812 |
Exercise price (in dollars per share) | $ / shares | $ 5.30 |
Expiration Date, February 5, 2019 [Member] |  |
Warrants and Rights [Abstract] |  |
Number of shares underlying warrants (in shares) | shares | 265,947 |
Exercise price (in dollars per share) | $ / shares | $ 3.75 |
[1] | These warrants are classified as liabilities.

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