Equity Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Stock Option Activity

The following is a summary of stock option activity: (in thousands, except exercise price data and contractual life data):

Options	Number of Shares			Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Life (Years)		Aggregate Intrinsic Value
Outstanding at December 31, 2015		3,423		$	2.35
Exercised		(925	)		2.36			$	4,278
Forfeited or cancelled		(165	)		3.61
Outstanding at December 31, 2016		2,333		$	2.26			$	11,061
Exercised		(915	)	$	1.89			$	3,689
Forfeited or cancelled		(90	)		2.48
Outstanding at December 31, 2017		1,328			2.50			$	6,175
Exercised		(177	)		2.42			$	407
Forfeited or cancelled		(36	)		4.40
Outstanding at December 31, 2018		1,115		$	2.45		3.75	$	970
Vested and Exercisable at December 31, 2018		1,096		$	2.38		3.71	$	970
Vested and Expected to Vest at December 31, 2018		984		$	2.47		4.03	$	892

Summary of Nonvested Restricted Stock and Restricted Stock Units Activity

The following is a summary of non-vested restricted stock and restricted stock units activity: (in thousands, except grant date fair value data):

	Number of Shares			Weighted-Average Grant Date Fair Value
Nonvested balance at December 31, 2015		1,268		$	6.39
Granted		931			6.78
Vested		(685	)		6.28
Forfeited or cancelled		(134	)		6.25
Nonvested balance at December 31, 2016		1,380		$	6.73
Granted		1,104			7.31
Vested		(844	)		6.64
Forfeited or cancelled		(83	)		7.21
Nonvested balance at December 31, 2017		1,557		$	7.18
Granted		1,121			3.20
Vested		(798	)		6.11
Forfeited or cancelled		(104	)		7.28
Nonvested balance at December 31, 2018		1,776		$	5.08