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Stock Based compensation - Additional Information (Detail) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jan. 01, 2019 | Jul. 10, 2018 | Mar. 31, 2017 | Mar. 31, 2014 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Stock options outstanding (in shares) |  |  |  |  | 2,190,360 |  |  |  | 1,635,790
Common stock, shares outstanding (in shares) |  |  |  |  | 11,422,161 |  |  |  | 11,422,161
Unamortized stock-based compensation expense |  |  |  |  | $ 1,343,624 |  |  |  |
Amortized weighted average period |  |  |  |  | 3 years 3 months 18 days |  |  |  |
Common stock, shares issued (in shares) |  |  |  |  | 11,422,161 |  |  |  | 11,422,161
Private Dare [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) |  |  |  |  | 3,140,000 |  |  |  |
Employee Stock Option [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Stock options outstanding (in shares) |  | 2,000,000 |  |  |  |  |  |  |
Stock-based compensation expense |  |  |  |  | $ 97,968 | $ 9,124 |  |  |
Options to purchase number of outstanding shares of common stock (in shares) | 2,503,771 | 2,046,885 |  |  | 2,190,360 |  |  |  |
Annual percentage increase in outstanding number of common stock | 4.00% | 4.00% |  |  |  |  |  |  |
Increase in number of shares authorized (in shares) | 456,886 |  |  |  |  |  |  |  |
Exercise period for stock options after termination date |  |  | 2 years |  |  |  |  |  |
Unamortized fair value expense |  |  | $ 3,700,000 |  |  |  |  |  |
Common stock reserved for future issuance (in shares) |  |  |  |  | 323,560 |  |  |  |
2015 Stock Incentive Plan [Member] | Employee Stock Option [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Stock options outstanding (in shares) |  |  |  |  | 10,149 |  |  |  |
2015 Stock Incentive Plan [Member] | Employee Stock Option [Member] | Private Dare [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Stock options grant period |  |  |  |  | 10 years |  |  |  |
Stock options vesting period |  |  |  |  | 3 years |  |  |  |
Stock options outstanding (in shares) |  |  |  |  | 50,000 |  |  |  | 10,149
2015 Stock Incentive Plan [Member] | Restricted Stock [Member] | Private Dare [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Shares issued to non-employees (in shares) |  |  |  |  |  |  | 200,000 | 900,000 |
Common stock, shares outstanding (in shares) |  |  |  |  | 223,295 |  |  |  |
2014 Employee Stock Purchase Plan [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Offering period |  |  |  | 6 months |  |  |  |  |
Purchase price as percentage of stock price on offering period |  |  |  | 85.00% |  |  |  |  |
Stock-based compensation expense |  |  |  |  | $ 0 | $ 0 |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 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.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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