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Warrants - Schedule of Warrants Issued and Outstanding (Details) - $ / shares | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Class Of Warrant Or Right [Line Items] |  |
Number of warrant shares | 956 | 156,294
Issuance Date, November 2012 Tranche One |  |
Class Of Warrant Or Right [Line Items] |  |
Exercise price | $ 6.00 | $ 6.00
Number of warrant shares | 7 | 7
Year of expiration | 2028 | 2028
Issuance Date, November 2012 Tranche Two |  |
Class Of Warrant Or Right [Line Items] |  |
Exercise price | $ 6.00 | $ 6.00
Number of warrant shares | 927 | 927
Year of expiration | 2020 | 2020
Issuance Date, November 2012 Tranche Three |  |
Class Of Warrant Or Right [Line Items] |  |
Exercise price | $ 14.50 | $ 14.50
Number of warrant shares | 22 | 22
Year of expiration | 2028 | 2028
Issuance Date, August 2016 |  |
Class Of Warrant Or Right [Line Items] |  |
Exercise price |  | $ 0.15
Number of warrant shares |  | 155,338
Year of expiration |  | 2023

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Number of warrants or rights outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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