Stock Option Plans (Tables)

6 Months Ended

Jun. 30, 2014

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of Stock Option Activity

Stock option activity under the Company’s award plans during the period indicated is as follows:

	Number of shares			Weighted average exercise price			Weighted average remaining contractual term
Balances at December 31, 2013		2,840,648		$	8.27			7.75
Granted		6,273,300			28.57
Exercised		(235,438	)		(4.30	)
Forfeited		(255,646	)		(19.51	)
Expired		(285	)		(7.12	)
Balances at June 30, 2014		8,622,579			22.82			9.00
Exercisable at June 30, 2014		1,242,345			7.86			6.39
Vested and Expected to Vest at June 30, 2014(1)		6,657,224			21.72			8.84

(1) The number of stock options expected to vest takes into account an estimate of expected forfeitures.