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Stockholders' Equity - Schedule of Common Stock Warrants Outstanding (Details) - $ / shares | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Apr. 11, 2019
Class of Warrant or Right [Line Items] |  |
Shares Underlying Outstanding Warrants | 3,750,833 |
Warrants Expiring on December 1, 2021 |  |
Class of Warrant or Right [Line Items] |  |
Shares Underlying Outstanding Warrants | 2,906 |
Exercise price (in usd per share) | $ 120.40 |
Expiration Date | Dec. 01, 2021 |
Warrants Expiring on December 6, 2021 |  |
Class of Warrant or Right [Line Items] |  |
Shares Underlying Outstanding Warrants | 3,737 |
Exercise price (in usd per share) | $ 120.40 |
Expiration Date | Dec. 06, 2021 |
Warrants Expiring on January 8, 2020 |  |
Class of Warrant or Right [Line Items] |  |
Shares Underlying Outstanding Warrants | 17,190 |
Exercise price (in usd per share) | $ 60.50 |
Expiration Date | Jan. 08, 2020 |
Warrants Expiring on April 4, 2026 |  |
Class of Warrant or Right [Line Items] |  |
Shares Underlying Outstanding Warrants | 6,500 |
Exercise price (in usd per share) | $ 10.00 |
Expiration Date | Apr. 04, 2026 |
Warrants Expiring on February 15, 2023 |  |
Class of Warrant or Right [Line Items] |  |
Shares Underlying Outstanding Warrants | 3,720,500 |
Exercise price (in usd per share) | $ 0.98 | $ 0.98
Expiration Date | Feb. 15, 2023 |

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