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Stockholders' Equity - Common Stock Warrants (Details) - $ / shares |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 19, 2018 | Sep. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Feb. 28, 2019 | Dec. 31, 2018
Common Stock Warrants |  |  |  |  |  |
Par value of common stock (in dollars per share) |  | $ 0.001 | $ 0.001 |  |  | $ 0.001
Common stock |  |  |  |  |  |
Common Stock Warrants |  |  |  |  |  |
Number of shares issued |  | 161,349 | 564,590 | 539,026 |  |
February 2019 Warrants | Common stock |  |  |  |  |  |
Common Stock Warrants |  |  |  |  |  |
Number of common shares which may be purchased with warrants |  |  |  |  | 2,000,000 |
February 2019 Warrants | Common stock warrants |  |  |  |  |  |
Common Stock Warrants |  |  |  |  |  |
Exercise price of warrants (in dollars per share) |  |  |  |  | $ 6.25 |
Warrants term |  |  |  |  | 5 years |
Warrants outstanding |  | 1,991,300 | 1,991,300 |  |  |
Weighted average remaining contractual life |  |  | 4 years 4 months 10 days |  |  |
June 2018 Warrants | Common stock |  |  |  |  |  |
Common Stock Warrants |  |  |  |  |  |
Number of shares issued | 4,200,000 |  |  |  |  |
Par value of common stock (in dollars per share) | $ 0.001 |  |  |  |  |
June 2018 Warrants | Common stock warrants |  |  |  |  |  |
Common Stock Warrants |  |  |  |  |  |
Number of common shares which may be purchased with warrants | 4,200,000 |  |  |  |  |
Exercise price of warrants (in dollars per share) | $ 12.00 |  |  |  |  |
Warrants term | 5 years |  |  |  |  |
Weighted average remaining contractual life |  |  | 3 years 8 months 23 days |  |  |

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