Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	6 Months Ended
	Mar. 30, 2020	Sep. 30, 2020	Jun. 30, 2020
HK Tainuo | Collaborative Arrangement
Summary Of Significant Accounting Policies [Line Items]
License agreement upfront payment.	$ 10,000
Revenue from contract with customer	0
Aggregate development, regulatory and commercial sales milestone payments	$ 32,500
Collaborative agreements term related to obligation and rights	the agreement prior to expiration in the event of a material breach if not cured within 60 days from the date of notice of such breach (30 days in the case of payment obligations), or either party files for bankruptcy.
Collaborative arrangement proceeds from upfront payment received			$ 5,000
HK Tainuo | Collaborative Arrangement | Forecast
Summary Of Significant Accounting Policies [Line Items]
Collaborative arrangement proceeds from upfront payment received		$ 5,000
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Trade Payment Term			1 year