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Stockholders' Equity - Summary of Warrant Activity (Details) - $ / shares | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Warrants outstanding [Roll Forward] |  |  |  |
Outstanding, beginning of period (in shares) | 93,835 | 20 | 1 |
Warrants issued (in shares) | 1,001,995 |  | 21 |
Warrants exercised (in shares) | (11,285) | (6,536) | (1) |
Exchanged (in shares) | (82,521) |  |  |
Warrants expired (in shares) |  | (1) | (1) |
Outstanding, end of period (in shares) | 1,002,024 | 93,835 | 20 | 1
Warrants, Weighted Average Exercise Price [Roll Forward] |  |  |  |
Outstanding, beginning of period (in dollars per share) | $ 150.67 | $ 4,868,205,366 | $ 637,218,564 |
Warrants issued (in dollars per share) | 42.00 |  | 1,610,000 |
Exchanged (in dollars per share) | 170.31 |  |  |
Warrants exercised (in dollars per share) | 7.00 | 1,252 | 2,954,000 |
Warrants expired (in dollars per share) |  | 13,798,400,000 | 591,675,000 |
Outstanding, end of period (in dollars per share) | $ 42.00 | $ 150.67 | $ 4,868,205,366 | $ 637,218,564
Weighted average remaining life | 5 years 18 days | 5 years 9 months | 4 years 10 months 17 days | 5 years 7 months 2 days
Minimum [Member] |  |  |  |
Warrants, Exercise Price per Share [Roll Forward] |  |  |  |
Outstanding, (in dollars per share) | $ 7.00 | $ 7.00 | $ 857,500 | $ 197,225,000
Maximum [Member] |  |  |  |
Warrants, Exercise Price per Share [Roll Forward] |  |  |  |
Outstanding, (in dollars per share) | $ 42.00 | $ 7,000 | $ 13,798,400,000 | $ 13,798,400,000
February 2018 Warrants [Member] |  |  |  |
Warrants outstanding [Roll Forward] |  |  |  |
Outstanding, beginning of period (in shares) | 273 |  |  |
Warrants issued (in shares) |  | 1,538 |  |
Outstanding, end of period (in shares) |  | 273 |  |
Warrants, Exercise Price per Share [Roll Forward] |  |  |  |
Outstanding, (in dollars per share) |  | $ 7,000 |  |
Warrants, Weighted Average Exercise Price [Roll Forward] |  |  |  |
Warrants issued (in dollars per share) |  | $ 6,531 |  |
Convertible Notes [Member] |  |  |  |
Warrants outstanding [Roll Forward] |  |  |  |
Warrants issued (in shares) |  | 98,814 |  |
Warrants, Weighted Average Exercise Price [Roll Forward] |  |  |  |
Warrants issued (in dollars per share) |  | $ 126 |  |

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