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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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- Definition

Aggregate number of common shares reserved for future issuance.

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- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements.

+ References

No definition available.

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- 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.

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- Definition

Number of shares authorized for issuance under share-based payment arrangement.

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- Definition

Number of options outstanding, including both vested and non-vested options.

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- Definition

Maximum number of shares that may be issued in accordance with the plan as a proportion of outstanding capital stock.

+ References

No definition available.

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- Definition

Number of increase (decrease) of non-vested options.

+ References

No definition available.

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- Definition

Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

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- Definition

Description of the reverse stock split arrangement. Also provide the retroactive effect given by the reverse split that occurs after the balance sheet date but before the release of financial statements.

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Stock-based compensation - Additional Information (Detail)				9 Months Ended	12 Months Ended
	Jan. 01, 2019 shares	Jul. 10, 2018 shares	Jul. 20, 2017	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense \| $					$ 462,239	$ 139,348
Reverse stock split					1-for-10
Reverse stock split, conversion ratio			0.1
Common stock, shares outstanding (in shares)					19,683,401	11,422,161
Common stock reserved for future issuance (in shares)					6,274,902
Unamortized stock-based compensation expense \| $				$ 1,100,000
Amortized weighted average period				2 years 6 months 26 days
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding (in shares)		2,000,000
Annual percentage increase in outstanding number of common stock	4.00%	4.00%
Number of authorized shares, period increase	456,886
Common stock reserved for future issuance (in shares)	878,130
Options to purchase number of outstanding shares of common stock (in shares)		2,046,885
2015 Stock Incentive Plan \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding (in shares)					10,149
2015 Stock Incentive Plan \| Stock Options \| Private Dare
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding (in shares)						10,149
2015 Stock Incentive Plan \| Restricted Stock \| Private Dare
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, shares outstanding (in shares)					223,295
2014 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense \| $					$ 0	$ 0
Amended And Restated Two Thousand Fourteen Stock Incentive Plan \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding (in shares)					1,889,775		539,896
Common stock reserved for future issuance (in shares)					634,294
Options to purchase number of outstanding shares of common stock (in shares)					1,889,775