STOCK-BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2014

STOCK-BASED COMPENSATION

Schedule of assumptions used to calculate the fair value of option grants

	2014	2013	2012
Employee and Director Stock Options
Risk-free interest rate	1.26 - 1.51%	0.67 - 1.38%	0.51 - 0.78%
Dividend yield	None	None	None
Expected option term (in years)	4.33 - 4.41	4.48 - 4.51	4.50 - 4.54
Expected stock price volatility	42.6 - 49.0%	49.2 - 63.5%	64.1 - 67.5%

Schedule of assumptions used to calculate the fair value of stock purchase rights granted under the ESPP

	2014	2013	2012
Employee and Director Stock Purchase Rights
Risk-free interest rate	0.06 - 0.08%	0.08 - 0.10%	0.12 - 0.16%
Dividend yield	None	None	None
Expected option term (in years)	0.5	0.5	0.5
Expected stock price volatility	44.8 - 61.4%	28.8 - 35%	35.6 - 44.3%

Schedule of stock-based compensation expense recognized for stock options, restricted stock units and the ESPP

The following table presents stock-based compensation expense recognized for stock options, restricted stock units and the ESPP in the Company's Statements of Operations (in thousands):

	2014		2013		2012
Cost of sales	$	14	$	42	$	41
Research and development expense		258		364		568
Selling, general and administrative expense		8,658		5,702		4,461
Total	$	8,930	$	6,108	$	5,070

The 2004 Plan

Stock-based compensation

Summary of the options activity under the plan

	Shares			Weighted- Average Exercise Price
Options outstanding at December 31, 2013		6,518,971		$	6.14
Options granted		1,605,385			12.64
Options exercised		(1,515,023	)		5.52
Options expired		(606,999	)		8.30
Options outstanding at December 31, 2014		6,002,334		$	7.84
Options vested and expected to vest at December 31, 2014		5,581,055		$	7.63
Options exercisable at December 31, 2014		3,491,018		$	6.76

	Weighted- Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value (in thousands)
Options outstanding at December 31, 2014		7.12	$	49,613
Options exercisable and expected to become exercisable at December 31, 2014		7.02	$	47,317
Options exercisable at December 31, 2014		6.43	$	32,648

Summary of information regarding the stock options outstanding under the plan

Range of Exercise Prices	Number Outstanding		Weighted- Average Remaining Contractual Term (Years)		Weighted- Average Exercise Price (Outstanding)		Number Exercisable		Weighted- Average Exercise Price (Exercisable)
$1.49 - $5.35		860,494		5.07	$	3.95		759,278	$	3.77
$5.56 - $5.91		690,578		7.35	$	5.78		441,736	$	5.75
$5.94 - $6.11		702,771		6.84	$	6.06		472,510	$	6.06
$6.14 - $6.29		145,741		4.68	$	6.21		101,679	$	6.24
$6.77 - $6.77		893,078		7.76	$	6.77		380,299	$	6.77
$7.02 - $8.36		764,825		6.62	$	7.88		631,493	$	7.95
$8.45 - $8.71		518,058		6.26	$	8.53		438,430	$	8.52
$9.02 - $9.02		2,187		6.22	$	9.02		1,875	$	9.02
$12.05 - $12.05		97,000		8.90	$	12.05		1,146	$	12.05
$12.69 - $12.69		1,327,602		8.81	$	12.69		262,572	$	12.69
		6,002,334		7.12	$	7.84		3,491,018	$	6.76

Schedule of restricted stock units

	Number of Shares			Weighted Average Grant Date Fair Value Per Share		Weighted Average Remaining Contractual Term (In years)
Non-vested restricted stock units at December 31, 2013		382,619		$	6.61
Granted		438,582		$	12.69
Vested		(231,686	)	$	12.69
Forfeited		(68,229	)	$	9.32
Non-vested restricted stock units at December 31, 2014		521,286		$	8.67		1.67

The 2014 Plan

Stock-based compensation

Summary of the options activity under the plan

	Shares			Weighted Average Exercise Price
Options outstanding at December 31, 2013		—		$	—
Options granted		753,672			13.40
Options expired		(8,000	)		11.90
Options outstanding at December 31, 2014		745,672		$	13.42
Options vested and expected to vest at December 31, 2014		526,914		$	13.40
Options exercisable at December 31, 2014		10,167		$	11.80

	Weighted- Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value (in thousands)
Options outstanding at December 31, 2014		9.61	$	2,008
Options exercisable and expected to become exercisable at December 31, 2014		9.61	$	1,429
Options exercisable at December 31, 2014		9.43	$	44

Summary of information regarding the stock options outstanding under the plan

Range of Exercise Prices	Number Outstanding		Weighted- Average Remaining Contractual Term (Years)		Weighted- Average Exercise Price (Outstanding)		Number Exercisable		Weighted- Average Exercise Price (Exercisable)
$10.80 - $10.80		82,000		9.58	$	10.80		0	$	0
$10.86 - $10.86		107,960		9.21	$	10.86		0	$	0
$11.11 - $11.11		10,000		9.39	$	11.11		8,333	$	11.11
$11.83 - $11.83		150,000		9.54	$	11.83		0	$	0
$11.84 - $11.84		7,000		9.41	$	11.84		0	$	0
$14.94 - $14.94		22,000		9.63	$	14.94		1,834	$	14.94
$15.02 - $15.02		63,300		9.73	$	15.02		0	$	0
$15.31 - $15.31		150,000		9.67	$	15.31		0	$	0
$15.53 - $15.53		59,112		9.92	$	15.53		—	$	0
$15.74 - $15.74		94,300		9.90	$	15.74		0	$	0
		745,672		9.61	$	13.42		10,167	$	11.80

Schedule of restricted stock units

	Number of Shares		Weighted Average Grant Date Fair Value Per Share		Weighted Average Remaining Contractual Term (In years)
Non-vested restricted stock units at December 31, 2013		—	$	—
Granted		23,178	$	15.53
Non-vested restricted stock units at December 31, 2014		23,178	$	15.53		0.92