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Fair Value Measurements - Additional Information (Details) - shares	Sep. 30, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Class Of Warrant Or Right [Line Items]
Number of warrants outstanding (in shares)	1,002,024	93,835	20	1
Febuary 2018 Warrants [Member]
Class Of Warrant Or Right [Line Items]
Number of warrants outstanding (in shares)	125,000

X

- 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	instant

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- Details

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Namespace Prefix:
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Balance Type:
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