Employee Stock and Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Total Stock-based Compensation Expense

Stock-based compensation expense recognized in our consolidated statements of operations includes amounts related to stock options, restricted stock, and employee stock purchase plans and was as follows (in thousands):

	Years Ended December 31,
	2015		2014		2013
Total stock-based compensation expense	$	4,698	$	5,204	$	7,468

Weighted-Average Assumptions Used to Determine Fair Value of Options Granted

The fair value of options granted used the following weighted average assumptions:

	Years ended December 31,
	2015		2014		2013
Expected dividend yield	—	%	—	%	—	%
Risk-free interest rate	1.47	%	1.40	%	0.86	%
Expected term (years)	4.8		4.5		4.3
Volatility	38	%	41	%	48	%

Schedule of Nonvested Restricted Stock Units Activity

Restricted stock unit and award activity was as follows (shares are in thousands):

	Shares		Weighted Average Grant Date Fair Value Per Share		Total Grant Date Fair Value of Vested Awards (000's)
Nonvested shares, December 31, 2012	1,249		$	8.52
Granted	232		7.18
Vested	(581	)	9.13		$	4,438
Forfeited/Canceled	(410	)	7.74
Nonvested shares, December 31, 2013	490		$	7.80
Granted	159		7.60
Vested	(193	)	8.35		$	1,608
Forfeited/Canceled	(56	)	7.73
Nonvested shares, December 31, 2014	400		$	7.47
Granted	296		5.44
Vested	(109	)	7.01		$	763
Forfeited/Canceled	(263	)	7.27
Nonvested shares, December 31, 2015	324		$	5.94

Schedule of Stock Options and Restricted Stock Units Activity

Stock option activity (shares are in thousands):

	Options Outstanding				Weighted Average Grant Date Fair Value
	Number of Shares		Weighted Average Exercise Price
Outstanding, December 31, 2012	4,534		$	14.07
Options granted at common stock price	3,578		7.56		$	2.93
Options exercised	(24	)	5.56
Options cancelled	(1,463	)	15.76
Outstanding, December 31, 2013	6,625		$	10.21
Options granted at common stock price	2,036		7.44		$	2.51
Options exercised	(44	)	7.26
Options cancelled	(1,893	)	14.47
Outstanding, December 31, 2014	6,724		$	8.19
Options granted at common stock price	907		5.31		$	1.70
Options exercised	(14	)	1.92
Options cancelled	(2,100	)	8.59
Outstanding, December 31, 2015	5,517		$	7.58
Exercisable, December 31, 2015	2,894		$	8.26
Vested and expected to vest, December 31, 2015	5,416		$	7.61