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Equity Financings and Warrants - Summary of Warrants by Year of Expiration (Details) | 12 Months Ended
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Dec. 31, 2017 $ / shares shares
Class Of Warrant Or Right [Line Items] |
Number of Warrants | shares | 3,633,008
Weighted Average Exercise Price | $ / shares | $ 8.32
2018 |
Class Of Warrant Or Right [Line Items] |
Year of Expiration | 2018
Number of Warrants | shares | 963,153
Weighted Average Exercise Price | $ / shares | $ 11.77
2019 |
Class Of Warrant Or Right [Line Items] |
Year of Expiration | 2019
Number of Warrants | shares | 224,323
Weighted Average Exercise Price | $ / shares | $ 15.73
2020 |
Class Of Warrant Or Right [Line Items] |
Year of Expiration | 2020
Number of Warrants | shares | 44,299
Weighted Average Exercise Price | $ / shares | $ 15.96
2022 |
Class Of Warrant Or Right [Line Items] |
Year of Expiration | 2022
Number of Warrants | shares | 2,401,233
Weighted Average Exercise Price | $ / shares | $ 6.10

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- Definition Weighted average exercise price of warrants or rights. + References No definition available. + Details
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- Definition Number of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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