Segment Reporting - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) segment	Dec. 31, 2019 USD ($)	Dec. 31, 2018
Segment Reporting Information [Line Items]
Number of operating business segment | segment	1
Property, plant and equipment, net	$ 59,662	$ 65,665
United States
Segment Reporting Information [Line Items]
Property, plant and equipment, net	54,500	59,700
India
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 5,100	$ 5,300
Revenue | BMS | Customer Concentration Risk
Segment Reporting Information [Line Items]
Percentage revenue from customers	33.00%		89.00%
Revenue | UCB | Customer Concentration Risk
Segment Reporting Information [Line Items]
Percentage revenue from customers	23.00%	28.00%
Revenue | Baxalta Incorporated / Takeda | Customer Concentration Risk
Segment Reporting Information [Line Items]
Percentage revenue from customers	14.00%	19.00%
Revenue | Astra Zeneca Ab | Customer Concentration Risk
Segment Reporting Information [Line Items]
Percentage revenue from customers	13.00%	17.00%
Property, Plant and Equipment | Geographic Concentration Risk | United States
Segment Reporting Information [Line Items]
Percentage revenue from customers	91.00%	92.00%
Property, Plant and Equipment | Geographic Concentration Risk | India
Segment Reporting Information [Line Items]
Percentage revenue from customers	9.00%	8.00%