Acquisitions - Summary of Pro Forma Financial Information (Detail) - Merck Serono $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) $ / shares shares
Business Acquisition [Line Items]
Total revenues	$ 962,853
Net loss	$ (143,506)
Net loss per share, basic and dilutive | $ / shares	$ (0.90)
Weighted average common shares outstanding, basic and diluted | shares	160,025