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Stockholders' Equity - Schedule of Common Stock Warrants Outstanding (Details) | 3 Months Ended
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Mar. 31, 2019 $ / shares shares
Class of Warrant or Right [Line Items] |
Shares Underlying Outstanding Warrants | 3,750,833
Warrants Expiring on December 1, 2021 [Member] |
Class of Warrant or Right [Line Items] |
Shares Underlying Outstanding Warrants | 2,906
Exercise price (in usd per share) | $ / shares | $ 120.40
Expiration Date | Dec. 01, 2021
Warrants Expiring on December 6, 2021 [Member] |
Class of Warrant or Right [Line Items] |
Shares Underlying Outstanding Warrants | 3,737
Exercise price (in usd per share) | $ / shares | $ 120.40
Expiration Date | Dec. 06, 2021
Warrants Expiring on January 8, 2020 [Member] |
Class of Warrant or Right [Line Items] |
Shares Underlying Outstanding Warrants | 17,190
Exercise price (in usd per share) | $ / shares | $ 60.50
Expiration Date | Jan. 08, 2020
Warrants Expiring on April 4, 2026 [Member] |
Class of Warrant or Right [Line Items] |
Shares Underlying Outstanding Warrants | 6,500
Exercise price (in usd per share) | $ / shares | $ 10.00
Expiration Date | Apr. 04, 2026
Warrants Expiring on February 15, 2023 [Member] |
Class of Warrant or Right [Line Items] |
Shares Underlying Outstanding Warrants | 3,720,500
Exercise price (in usd per share) | $ / shares | $ 3.00
Expiration Date | Feb. 15, 2023

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