CAPITAL STOCK (Tables)

12 Months Ended

Dec. 31, 2016

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, 2016 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, 2016	4,345,334		$10.68
Granted	—		$—
Exercised	(787,867	)	$7.67
Forfeited or canceled	(709,965	)	$15.06
Options outstanding at December 31, 2016	2,847,502		$10.43	2.85	$—
Options vested at December 31, 2016 or expected to vest	2,847,502		$10.43	2.85	$—
Options exercisable at December 31, 2016	2,707,454		$10.57	2.78	$—

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 and 2014. No options were granted during the year ended December 31, 2016.



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

Non-vested restricted stock and restricted stock units

Information with respect to non-vested restricted stock units for the year ended December 31, 2016 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, 2016	1,266,008		$9.97
Granted	1,880,411		$6.25
Vested	(465,392	)	$11.74
Forfeited	(525,246	)	$7.93
Non-vested at December 31, 2016	2,155,781		$6.85	1.13	$9,464
Expected to vest	1,520,098		$6.70	1.13	$6,673

Employee stock purchase plan

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, 2016, 2015 and 2014:



	Year Ended December 31,
	2016	2015	2014
Expected dividend yield	0.00%	0.00%	0.00%
Risk-free interest rate	0.40%	0.03%	0.09%
Expected volatility	69.0%	37.0%	35.0%
Expected life (in years)	0.49	0.24	0.17
Weighted-average fair value of shares issued (per share)	$1.20	$2.15	$2.02

The following table sets forth the quantities and average prices of shares issued under the ESPP for the years ended December 31, 2016, 2015 and 2014:



	Year Ended December 31,
	2016	2015	2014
Shares issued under the ESPP	129,342	98,300	—
Average price of shares issued	$4.35	$10.17	$—

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, 2016, 2015 and 2014, respectively (in thousands):



	Year Ended December 31,
	2016		2015		2014
Cost of products revenues	$	60	$	199	$	397
Cost of services revenues	381		624		279
Research and development expenses	376		461		502
Marketing and selling expenses	1,958		1,785		3,658
General and administrative expenses	5,141		6,445		6,677
Total	$	7,916	$	9,514	$	11,513