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Acquisitions - Additional Information (Detail) - USD ($) |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
May 16, 2018 | Apr. 30, 2018 | Jul. 19, 2017 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2017
Business Combination Reverse Merger [Line Items] |  |  |  |  |  |
Cash and cash equivalents |  |  | $ 9,918,000 |  |  |
Unamortized fair value of stock options |  |  | 3,654,000 |  |  |
Stock option modification approval date |  |  |  | Mar. 19, 2017 |  |
Total purchase price consideration |  |  | 24,279,000 |  |  |
Purchase price adjustments increase in current liabilities |  |  | 23,609 |  |  |
Purchase price adjustments increase in current assets |  |  | 225,778 |  |  |
Original goodwill amount acquired |  |  | 12,900,000 |  |  |
Reduced original goodwill |  |  | 202,169 |  |  |
Goodwill impairment charge |  |  |  | $ 0 | $ 5,187,519 | $ 7,500,000
Goodwill |  |  | 12,679,000 |  |  | $ 5,200,000
Pear Tree Pharmaceuticals, Inc. [Member] |  |  |  |  |  |
Business Combination Reverse Merger [Line Items] |  |  |  |  |  |
Merger Agreement entered date |  | Apr. 30, 2018 |  |  |  |
Business combination completed date | May 16, 2018 |  |  |  |  |
Consideration amount | $ 132,000 |  |  |  |  |
Potential cash payments to acquire business | 75,000 |  |  |  |  |
General and Administrative Expense [Member] |  |  |  |  |  |
Business Combination Reverse Merger [Line Items] |  |  |  |  |  |
Transaction costs |  |  | $ 960,000 |  |  |
Research and Development Expense [Member] | Pear Tree Pharmaceuticals, Inc. [Member] |  |  |  |  |  |
Business Combination Reverse Merger [Line Items] |  |  |  |  |  |
Transaction costs | $ 452,000 |  |  |  |  |
Private Dare [Member] |  |  |  |  |  |
Business Combination Reverse Merger [Line Items] |  |  |  |  |  |
Stock purchase transaction completion date |  |  |  | Jul. 19, 2017 |  |
Stock purchase agreement date |  |  |  | Mar. 19, 2017 |  |
Business combination completed date |  |  |  | Jul. 19, 2017 |  |

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