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Net Loss Per Share Attributable to Common Stockholders - Anti-dilutive effect (Details) - shares	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Antidilutive Securities
Antidilutive securities excluded from computation of diluted net loss per share			15,802,648	5,043,746
Preferred Stock
Antidilutive Securities
Antidilutive securities excluded from computation of diluted net loss per share			15,560,569	4,978,957
Option to purchase common stock
Antidilutive Securities
Antidilutive securities excluded from computation of diluted net loss per share	2,248,953	2,248,953	242,079	64,783

X

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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- Definition

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+ References

No definition available.

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