CAPITAL STOCK (Tables)

12 Months Ended

Dec. 31, 2014

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

Information with respect to options granted under all stock option plans for the year ended December 31, 2014 was as follows:



	Total Shares		Weighted- Average Exercise Price	Weighted- Average Remaining Contractual Term (years)	Aggregate Intrinsic Value (in thousands)
Options outstanding at January 1, 2014	4,726,415		$14.18
Granted	2,097,350		$7.54
Exercised	(25,505	)	$9.79
Forfeited or canceled	(1,234,149	)	$16.44
Options outstanding at December 31, 2014	5,564,111		$11.20	4.83	$24,940
Options vested at December 31, 2014 or expected to vest	5,272,012		$11.38	4.71	$23,086
Options exercisable at December 31, 2014	3,044,259		$13.81	3.91	$9,144

The following table sets forth the weighted-average key assumptions and fair value results for stock options granted during the years ended December 31, 2014, 2013 and 2012:



	Year Ended December 31,
	2014	2013	2012
Expected dividend yield	0.00%	0.00%	0.00%
Risk-free interest rate	1.24%	0.87%	0.94%
Expected volatility	50.3%	50.1%	52.8%
Expected life (in years)	4.16	4.68	4.56
Weighted-average fair value of options granted (per share)	$3.03	$3.33	$4.89

Non-vested restricted stock and restricted units

Information with respect to non-vested restricted stock units for the year ended December 31, 2014 was as follows:



	Non-Vested Restricted Stock Units
	Total Shares		Weighted- Average Grant-Date Fair Value	Weighted- Average Remaining Contractual Term (years)	Aggregate Intrinsic Value (in thousands)
Non-vested at January 1, 2014	322,733		$11.30
Granted	801,316		$10.19
Vested	(264,513	)	$11.19
Forfeited	(47,656	)	$15.25
Non-vested at December 31, 2014	811,880		$10.01	0.88	$11,529
Expected to vest	741,436		$10.02	0.84	$10,528

Weighted-average key assumptions for shares issued under the ESPP

The following table sets forth the weighted-average key assumptions and fair value results for shares issued under the ESPP during the years ended December 31, 2014, 2013 and 2012:



	Year Ended December 31,
	2014	2013	2012
Expected dividend yield	0.00%	0.00%	0.00%
Risk-free interest rate	0.09%	0.09%	0.08%
Expected volatility	35.0%	51.0%	51.5%
Expected life (in years)	0.17	0.25	0.25
Weighted-average fair value of shares issued (per share)	$2.02	$1.00	$1.30

The following table sets forth the quantities and average prices of shares issued under the ESPP for the years ended December 31, 2014, 2013 and 2012:



	Year Ended December 31,
	2014	2013	2012
Shares issued under the ESPP	—	27,936	142,658
Average price of shares issued	$—	$6.29	$6.96

Allocated share-based compensation expense

Stock-based compensation was included in the following captions in the Company’s consolidated statements of operations for the years ended December 31, 2014, 2013 and 2012, respectively (in thousands):



	Year Ended December 31,
	2014		2013		2012
Cost of products revenues	$	397	$	360	$	410
Cost of services revenues	279		436		582
Research and development expenses	502		582		986
Marketing and selling expenses	3,658		1,778		3,754
General and administrative expenses	6,677		3,761		5,700
Total	$	11,513	$	6,917	$	11,432