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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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- Definition

The entity considers investments with original maturities of certain months or less at the date of acquisition to be cash equivalents.

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Summary of significant accounting policies.

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The number of derivative instruments of a particular group held by the entity.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

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-Section 50
-Paragraph 1B
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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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