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v3.19.2

Summary of Significant Accounting Policies - Additional Information (Details) shares in Millions | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 shares | Dec. 31, 2018 Derivative Segment shares | Dec. 31, 2017 Derivative
Summary Of Significant Accounting Policies [Line Items] |  |  |
Maximum period of investments with original maturities from date of acquisition to be cash equivalents |  | 3 months |
Pre-funded penny warrants outstanding | shares | 53.4 | 61.3 |
Number of business segments | Segment |  | 1 |
Designated as Hedges [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Number of derivative instruments | Derivative |  | 0 | 0
Minimum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment, estimated useful life |  | 3 years |
Maximum [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Property, plant and equipment, estimated useful life |  | 7 years |

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