Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2019

Share-based Payment Arrangement [Abstract]

Summary of stock option activity

A summary of stock option activity during the nine months ended September 30, 2019 is as follows (in thousands, except for per share amounts):

	Shares		Weighted- Average Exercise Price (in dollars per share)		Weighted- Average Contractual Life (in years)	Aggregate Intrinsic Value
Options outstanding at December 31, 2018	5,463		$	36.88
Granted	1,044		19.72
Exercised	(341	)	8.40
Canceled	(499	)	33.99
Expired	(806	)	40.15
Options outstanding at September 30, 2019	4,861		$	34.94	7.39	$	11,716
Options exercisable at September 30, 2019	2,810		$	39.87	6.40	$	4,900

Summary of restricted stock units activity

A summary of RSU activity during the nine months ended September 30, 2019 is as follows (in thousands, except for per share amounts):

	RSUs		Weighted- Average Grant Date Fair Value  (in dollars  per share)
RSUs Outstanding at December 31, 2018	227		$	37.69
Granted	613		20.04
Vested	(75	)	38.59
Forfeited	(110	)	26.35
RSUs Outstanding at September 30, 2019	655		$	22.93

A summary of PSU activity during the nine months ended September 30, 2019 is as follows (in thousands, except for per share amounts):

	PSUs	Weighted- Average Grant Date Fair Value  (in dollars  per share)
PSUs Outstanding at December 31, 2018	—	$	—
Granted	79	19.20
Vested	—	—
Forfeited	—	—
PSUs Outstanding at September 30, 2019	79	$	19.20