Discontinued Operations - Results from Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Other income (expense):
Loss from discontinued operations, net of applicable taxes	$ (91)	$ (2,369)
International operations | Discontinued operations, disposed of by sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues		10,555
Cost of revenues		3,813
Amortization of acquired intangible assets		360
Gross profit		6,382
Operating expenses:
Research and development		26
Sales and marketing		4,182
General and administrative	73	1,643
Amortization of acquired intangible assets		231
Restructuring expenses		597
Total operating expenses	73	6,679
Operating loss	(73)	(297)
Other income (expense):
Interest expense, net		(2,356)
Other income (expense), net		847
Total other income (expense)		(1,509)
Loss from discontinued operations before taxes	(73)	(1,806)
Income tax provision	18	563
Loss from discontinued operations, net of applicable taxes	$ (91)	$ (2,369)