CAPITAL STOCK (Tables)

12 Months Ended

Dec. 31, 2018

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, 2018 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, 2018	2,290,017		$9.65
Granted	—		$—
Exercised	—		$—
Forfeited or canceled	(1,398,125	)	$10.42
Options outstanding at December 31, 2018	891,892		$8.46	1.55	$—
Options vested at December 31, 2018 or expected to vest	891,892		$8.46	1.55	$—
Options exercisable at December 31, 2018	891,892		$8.46	1.55	$—

No options were granted during the years ended December 31, 2018, 2017, and 2016.

Non-vested restricted stock and restricted stock units

Information with respect to non-vested restricted stock units for the year ended December 31, 2018 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, 2018	3,063,248		$5.10
Granted	2,554,852		$5.01
Vested	(688,106	)	$5.61
Forfeited	(1,985,175	)	$5.10
Non-vested at December 31, 2018	2,944,819		$4.91	1.10	$13,958
Expected to vest	2,205,433		$5.04	1.10	$10,454

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, 2018, 2017 and 2016:



	Year Ended December 31,
	2018	2017	2016
Expected dividend yield	0.00%	0.00%	0.00%
Risk-free interest rate	1.85%	0.83%	0.40%
Expected volatility	55.3%	62.0%	69.0%
Expected life (in years)	0.50	0.49	0.49
Weighted-average fair value of shares issued (per share)	$0.94	$0.86	$1.20

The following table sets forth the quantities and average prices of shares issued under the ESPP for the years ended December 31, 2018, 2017 and 2016:



	Year Ended December 31,
	2018	2017	2016
Shares issued under the ESPP	117,653	96,507	129,342
Average price of shares issued	$4.22	$4.53	$4.35

Allocated share-based compensation expense

Stock-based compensation was included in the following captions in our consolidated statements of operations for the years ended December 31, 2018, 2017 and 2016, respectively (in thousands):



	Year Ended December 31,
	2018		2017		2016
Cost of products revenues	$	128	$	53	$	60
Cost of services revenues	194		189		381
Research and development expenses	667		694		376
Marketing and selling expenses	1,540		1,944		1,958
General and administrative expenses	3,729		5,431		5,141
Total	$	6,258	$	8,311	$	7,916