Acquisitions and Business Combinations - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended
	Jun. 27, 2019	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Business Acquisition [Line Items]
Goodwill		$ 38,480		$ 38,513
Total revenue		46,935	$ 25,307
Net loss		(19,429)	(35,233)
Oncology Innovation Platform
Business Acquisition [Line Items]
Net loss		(958)	$ (27,603)
CIDAL Limited
Business Acquisition [Line Items]
Asset purchase agreement closing date	Oct. 31, 2019
Cash received	$ 900
Liabilities assumed	1,100
Goodwill	1,000
Contingent equity consideration	800
CIDAL Limited | Oncology Innovation Platform
Business Acquisition [Line Items]
Total revenue		100
Net loss		$ (1,000)
CIDAL Limited | Maximum
Business Acquisition [Line Items]
Property and equipment	$ 100
CIDAL Limited | Common Stock
Business Acquisition [Line Items]
Business acquisition and milestone payments aggregate share consideration	67,796