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Stockholders' Equity - Summary of Warrant Activity (Details) - $ / shares | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Warrants outstanding [Roll Forward] |  |  |  |
Outstanding, beginning of period (in shares) | 65,685,269 | 14,049 | 78 |
Warrants issued (in shares) |  |  | 14,256 |
Warrants exercised (in shares) | (7,898,853) | (4,574,529) | (246) |
Exchanged (in shares) | (64,000) |  |  |
Warrants expired (in shares) |  | (9) | (39) |
Outstanding, end of period (in shares) | 57,722,416 | 65,685,269 | 14,049 | 78
Warrants, Exercise Price per Share [Roll Forward] |  |  |  |
Outstanding, (in dollars per share) | $ 0.23 | $ 0.22 | $ 1,569 | $ 910,000
Warrants, Weighted Average Exercise Price [Roll Forward] |  |  |  |
Outstanding, beginning of period (in dollars per share) | 0.22 | 1,569 | 910,000 |
Warrants issued (in dollars per share) |  |  | 2,299 |
Warrants exercised (in dollars per share) | 0.01 | 1.79 | 4,221 |
Warrants expired (in dollars per share) |  | 19,712,000 | 845,250 |
Outstanding, end of period (in dollars per share) | $ 0.23 | $ 0.22 | $ 1,569 | $ 910,000
Weighted average remaining life | 5 years 2 months 26 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) | $ 0.01 | $ 0.01 | $ 1,225 | $ 281,750
Maximum [Member] |  |  |  |
Warrants, Exercise Price per Share [Roll Forward] |  |  |  |
Outstanding, (in dollars per share) | $ 10.00 | $ 10.00 | $ 19,712,000 | $ 19,712,000
February 2018 Warrants [Member] |  |  |  |
Warrants outstanding [Roll Forward] |  |  |  |
Outstanding, beginning of period (in shares) | 200,000 |  |  |
Warrants issued (in shares) |  | 1,076,002 |  |
Outstanding, end of period (in shares) |  | 200,000 |  |
Warrants, Exercise Price per Share [Roll Forward] |  |  |  |
Outstanding, (in dollars per share) |  | $ 10.00 |  |
Warrants, Weighted Average Exercise Price [Roll Forward] |  |  |  |
Warrants issued (in dollars per share) |  | $ 9.33 |  |
Short Term Convertible Notes Payable [Member] |  |  |  |
Warrants outstanding [Roll Forward] |  |  |  |
Warrants issued (in shares) |  | 69,169,756 |  |
Warrants, Weighted Average Exercise Price [Roll Forward] |  |  |  |
Warrants issued (in dollars per share) |  | $ 0.18 |  |

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