CAPITAL STOCK (Tables)

12 Months Ended

Dec. 31, 2015

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, 2015 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, 2015	5,564,111		$11.20
Granted	4,000		$9.10
Exercised	(421,961	)	$9.55
Forfeited or canceled	(800,816	)	$14.84
Options outstanding at December 31, 2015	4,345,334		$10.68	4.05	$—
Options vested at December 31, 2015 or expected to vest	4,289,778		$10.72	4.03	$—
Options exercisable at December 31, 2015	3,622,761		$11.28	3.82	$—

The following table sets forth the weighted-average key assumptions and fair value results for stock options granted during the years ended December 31, 2015, 2014 and 2013:



	Year Ended December 31,
	2015	2014	2013
Expected dividend yield	0.00%	0.00%	0.00%
Risk-free interest rate	1.07%	1.24%	0.87%
Expected volatility	52.0%	50.3%	50.1%
Expected life (in years)	4.48	4.16	4.68
Weighted-average fair value of options granted (per share)	$3.91	$3.03	$3.33

Non-vested restricted stock and restricted units

Information with respect to non-vested restricted stock units for the year ended December 31, 2015 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, 2015	811,880		$10.01
Granted	1,264,116		$10.31
Vested	(421,314	)	$10.04
Forfeited	(388,674	)	$10.90
Non-vested at December 31, 2015	1,266,008		$9.97	0.99	$9,216
Expected to vest	820,741		$11.14	0.94	$5,975

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, 2015, 2014 and 2013:



	Year Ended December 31,
	2015	2014	2013
Expected dividend yield	0.00%	0.00%	0.00%
Risk-free interest rate	0.03%	0.09%	0.09%
Expected volatility	37.0%	35.0%	51.0%
Expected life (in years)	0.24	0.17	0.25
Weighted-average fair value of shares issued (per share)	$2.15	$2.02	$1.00

The following table sets forth the quantities and average prices of shares issued under the ESPP for the years ended December 31, 2015, 2014 and 2013:



	Year Ended December 31,
	2015	2014	2013
Shares issued under the ESPP	98,300	—	27,936
Average price of shares issued	$10.17	$—	$6.29

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, 2015, 2014 and 2013, respectively (in thousands):



	Year Ended December 31,
	2015		2014		2013
Cost of products revenues	$	199	$	397	$	360
Cost of services revenues	624		279		436
Research and development expenses	461		502		582
Marketing and selling expenses	1,785		3,658		1,778
General and administrative expenses	6,445		6,677		3,761
Total	$	9,514	$	11,513	$	6,917