CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
Revenues	$ 120,248	$ 134,388	$ 154,625
Cost of revenues	44,114	46,366	44,958
Gross profit	76,134	88,022	109,667
Operating expenses:
Research and development	9,248	17,615	16,593
In-process research and development		274	527
Sales and marketing	50,962	51,801	55,782
General and administrative	26,339	28,126	34,048
Amortization of intangible assets	934	1,200	1,232
Goodwill and intangible assets impairment	1,736	164,263	0
Restructuring expenses	2,292	597
Total operating expenses	91,511	263,876	108,182
Operating (loss) income	(15,377)	(175,854)	1,485
Other income (expense):
Interest income	3	11	10
Interest expense	(5,368)	(4,001)	(3,022)
Loss on debt extinguishment	(9,478)
Other income (expense), net	(715)	7,445	1,836
Total other income (expense)	(15,558)	3,455	(1,176)
Income (loss) from continuing operations before taxes	(30,935)	(172,399)	309
Income tax (benefit) provision	(4,634)	(1,146)	407
Loss from continuing operations	(26,301)	(171,253)	(98)
Loss from discontinued operations, net of applicable taxes	(3,624)	(7,423)	(12,784)
Net loss	$ (29,925)	$ (178,676)	$ (12,882)
Loss per share, basic:
Continuing operations	$ (3.06)	$ (20.64)	$ (0.01)
Discontinued operations	(0.42)	(0.89)	(1.58)
Net loss per share, basic	(3.49)	(21.53)	(1.59)
Net loss per share, diluted:
Continuing operations	(3.06)	(20.64)	(0.33)
Discontinued operations	(0.42)	(0.89)	(1.57)
Net loss per share, diluted	$ (3.49)	$ (21.53)	$ (1.90)
Shares used in calculating basic net loss per share	8,582	8,298	8,112
Shares used in calculating diluted net loss per share	8,582	8,298	8,145