Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Summary Of Significant Accounting Policies [Line Items]
Carrying value of short-term investments	$ 1,997	$ 22,520
Inventory reserve	282	464
Interest costs capitalized	212
Property and equipment, net	22,547	15,961
Accumulated depreciation	10,809	9,769
Remaining performance obligations	$ 20,967
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Explanation	The Company expects to recognize revenue on the remaining performance obligations over the next four years.
Licensing and Development Revenue [Member]
Summary Of Significant Accounting Policies [Line Items]
Revenue recognized	$ 780
Teva [Member]
Summary Of Significant Accounting Policies [Line Items]
Future net profits from commercial sales percent	50.00%
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Royalty payment period	45 days
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Royalty payment period	60 days
Level 1 Input [Member]
Summary Of Significant Accounting Policies [Line Items]
Cash and cash equivalents, remeasured and reported at fair value	$ 32,104	$ 11,153