Subsequent Events - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended	6 Months Ended
	Jul. 29, 2019	Jul. 08, 2019	Jul. 31, 2019	Jun. 30, 2019	Mar. 20, 2019
Subsequent Event [Line Items]
Purchase common stock per share amount					$ 19.37
MSA or Product Agreement [Member]
Subsequent Event [Line Items]
Agreement initial term, expiration date				Either party may terminate the MSA or a Product Agreement upon written notice if the other party (1) has failed to remedy a material breach within a specified time or (2) is declared insolvent or bankrupt, voluntarily files a petition of bankruptcy or assigns such agreement for the benefit of creditors. The Company may terminate a Product Agreement (a) upon 90 days’ prior written notice if any governmental agency takes any action that prevents the Company from selling the relevant product in the relevant territory, (b) upon six months’ prior written notice if it does not intend to order manufacturing services due to a product’s discontinuance in the market, or (c) upon 90 days’ prior written notice if it determines that the manufacture or supply of a product likely infringes third-party rights. Patheon may terminate the MSA or a Product Agreement (i) upon six months’ prior written notice if the Company assigns such agreement to an assignee that is unacceptable to Patheon for certain reasons, or (ii) upon 30 days’ prior written notice if, after the first year of commercial sales, the Company forecasts zero volume for 12 months.
Subsequent Event [Member] | MSA [Member]
Subsequent Event [Line Items]
Agreement initial term, expiration date		Dec. 31, 2023
Agreement renewal term		2 years
Subsequent Event [Member] | MSA [Member] | Minimum [Member]
Subsequent Event [Line Items]
Termination notice effective period		18 months
Common Stock [Member] | Follow-on Public Offering [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Common stock, shares issued	6,325,000		6,325,000
Purchase common stock per share amount			$ 23.00
Proceeds from issuance of common stock net of underwriting discounts, commissions and estimated offering expenses	$ 136,446		$ 136,446
Underwriting discounts, commission and estimated offering expenses	$ 9,029
Common Stock [Member] | Underwriter's Over-Allotment [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Common stock, shares issued	825,000		825,000