Segment Reporting - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) Segment	Dec. 31, 2018 USD ($)	Dec. 31, 2017
Segment Reporting Information [Line Items]
Number of operating business segment | Segment	1
Property, plant and equipment, net	$ 64,999	$ 48,851
United States
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 59,700	$ 42,900
Percentage of net book value of property and equipment	92.00%	88.00%
India
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 5,300	$ 5,900
Percentage of net book value of property and equipment	8.00%	12.00%
Revenue | BMS | Customer Concentration Risk
Segment Reporting Information [Line Items]
Percentage revenue from customers		89.00%
Revenue | Eli Lilly & Company | Customer Concentration Risk
Segment Reporting Information [Line Items]
Percentage revenue from customers			42.00%
Revenue | UCB | Customer Concentration Risk
Segment Reporting Information [Line Items]
Percentage revenue from customers	28.00%		12.00%
Revenue | Baxalta Incorporated / Takeda | Customer Concentration Risk
Segment Reporting Information [Line Items]
Percentage revenue from customers	19.00%
Revenue | AstraZeneca AB | Customer Concentration Risk
Segment Reporting Information [Line Items]
Percentage revenue from customers	17.00%