STOCK-BASED COMPENSATION PLANS (Tables)

12 Months Ended

Dec. 31, 2017

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

Schedule of stock-based compensation, net of estimated forfeitures

The following table summarizes the amount of stock-based compensation, net of estimated forfeitures, included in the consolidated statements of operations and comprehensive loss (in thousands): 

	Year Ended December 31,
	2017		2016		2015
Costs of customer support	$	167	$	1,159	$	1,901
Sales, general and administrative	2,873		3,838		6,880
	$	3,040	$	4,997	$	8,781

Schedule of stock option activity of stock-based compensation plans

Stock option activity during the year ended December 31, 2017 under all of our stock-based compensation plans was as follows (shares in thousands): 

	Shares		Weighted Average Exercise Price
Balance, December 31, 2016	795		$	27.80
Granted	—		—
Exercised	(49	)	8.80
Forfeitures and post-vesting cancellations	(430	)	31.72
Balance, December 31, 2017	316		25.40
Exercisable, December 31, 2017	277		26.25

Schedule of fully vested and exercisable stock options and stock options expected to vest

Fully vested and exercisable stock options and stock options expected to vest as of December 31, 2017 are further summarized as follows (shares in thousands): 

	Fully Vested and Exercisable		Expected to Vest
Total shares	277		316
Weighted-average exercise price	$	26.25	$	25.40
Aggregate intrinsic value	$	—	$	—
Weighted-average remaining contractual term (in years)	3.9		4.4

Schedule of restricted stock activity

Restricted stock activity during the year ended December 31, 2017 was as follows (shares in thousands): 

	Shares		Weighted- Average Grant Date Fair Value
Unvested balance, December 31, 2016	555		$	4.52
Granted	483		$	6.20
Vested	(172	)	$	8.63
Forfeited	(106	)	$	9.00
Unvested balance, December 31, 2017	760		$	4.03

Schedule of unrecognized compensation costs related to unvested stock-based compensation

Total unrecognized compensation costs related to unvested stock-based compensation as of December 31, 2017 is as follows (dollars in thousands): 

	Stock Options		Restricted Stock		Total
Unrecognized compensation	$	241	$	2,972	$	3,213
Weighted-average remaining recognition period (in years)	2.51		1.87		1.92