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Fair Value Measurements - Additional Information (Details) - shares | Jun. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Class Of Warrant Or Right [Line Items] |  |  |  |
Number of warrants outstanding (in shares) | 57,722,416 | 65,685,269 | 14,049 | 78
Febuary 2018 Warrants [Member] |  |  |  |
Class Of Warrant Or Right [Line Items] |  |  |  |
Number of warrants outstanding (in shares) | 125,000 |  |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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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- Details
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