Segment Reporting - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended		12 Months Ended
	Dec. 31, 2013 Segment	Dec. 31, 2012	Dec. 31, 2011 Roche [Member]	Dec. 31, 2011 UCB [Member]	Dec. 31, 2013 Revenue [Member] Roche [Member]	Dec. 31, 2012 Revenue [Member] Roche [Member]	Dec. 31, 2013 Revenue [Member] UCB [Member]	Dec. 31, 2012 Revenue [Member] UCB [Member]	Dec. 31, 2013 Revenue [Member] AstraZeneca [Member]	Dec. 31, 2013 Revenue [Member] Bayer [Member]	Dec. 31, 2012 Revenue [Member] Affymax, Inc. [Member]	Dec. 31, 2013 United States [Member]	Dec. 31, 2012 United States [Member]	Dec. 31, 2013 India [Member]	Dec. 31, 2012 India [Member]
Segment Reporting Information [Line Items]
Number of operating business segment	1
Number of components within business segment	2
Percentage revenue from clients			16.00%	27.00%	28.00%	23.00%	21.00%	30.00%	17.00%	10.00%	11.00%
Property and equipment, net	$ 66,974	$ 72,215										$ 57,300	$ 62,500	$ 7,700	$ 9,700
Percentage of net book value of property and equipment												88.00%	87.00%	12.00%	13.00%