v3.19.3.a.u2

Stock-Based Compensation - Schedule of Assumptions Used in Black-Scholes Option-Pricing Method (Details) - $ / shares	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Expected dividend yield	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
Expected stock-price volatility, minimum	69.00%	48.89%	46.33%	46.47%	46.47%	53.08%
Expected stock-price volatility, maximum	69.38%	50.22%	69.38%	53.11%	53.11%	54.08%
Risk-free interest rate, minimum	1.47%	2.78%	1.47%	2.46%	2.46%	1.89%
Risk-free interest rate, maximum	1.54%	3.07%	2.60%	3.07%	3.07%	2.58%
Expected average term of options						10 years
Stock price	$ 1.04
Minimum [Member]
Expected average term of options	5 years	7 years	5 years	5 years	5 years
Stock price		$ 1.85	$ 0.60	$ 1.85	$ 1.85	$ 0.30
Maximum [Member]
Expected average term of options	7 years	10 years	7 years	10 years	10 years
Stock price		$ 2.22	$ 1.04	$ 3.40	$ 3.40	$ 3.48

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- Definition

Stock price.

+ References

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- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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- Definition

The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

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- Definition

The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

The minimum risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(i)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

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