Consolidated Statements of Operations - USD ($) shares in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Net revenue	$ 44,100,000	$ 62,800,000
Cost of goods sold	24,700,000	38,100,000
Gross profit	19,400,000	24,700,000
Operating expenses:
Selling, general and administrative	34,900,000	59,100,000
Research and development	11,900,000	12,200,000
Impaired Charges:
Goodwill	0	28,100,000
Other Intangibles	0	29,700,000
Restructuring and other	7,600,000	36,500,000
Total	54,400,000	165,600,000
Operating loss from continuing operations	(35,000,000)	(140,900,000)
Other income (expense)
Interest income	200,000	400,000
Interest expense	0	(2,700,000)
Other income (expense), net	(4,900,000)	400,000
Total	(4,700,000)	(1,900,000)
Loss from continuing operations before income taxes	(39,700,000)	(142,800,000)
Income tax (provision) benefit	(100,000)	100,000
Loss from continuing operations	(39,800,000)	(142,700,000)
Discontinued operations:
Loss from discontinued operations, net of income taxes	(13,400,000)	(63,100,000)
Gain on sale of discontinued businesses	3,800,000	11,800,000
Reclassification of cumulative translation adjustment	(75,800,000)	0
Loss from discontinued operations	(85,400,000)	(51,300,000)
Net loss	$ (125,200,000)	$ (194,000,000)
Loss per common share — basic and diluted:
Continuing operations, basic and diluted (in dollars per share)	$ (10.76)	$ (35.68)
Discontinued operations, basic and diluted (in dollars per share)	(23.08)	(12.82)
Net loss, basic and diluted (in dollars per share)	$ (33.84)	$ (48.50)
Weighted average common shares outstanding:
Basic and diluted (in shares)	3.7	4.0