Additional Financial Information Related to Balance Sheet (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Schedule of Condensed Consolidating Balance Sheets [Line Items]
Property plant and equipment gross	$ 64,964	$ 70,760
Accumulated depreciation	(58,584)	(60,123)
Construction in progress	19	325
Property and Equipment	6,380	10,637
Accrued liabilities and other
Accrued enhancement expense-current	1,076	1,343
Accrued payroll and related benefits	1,846	2,472
Restructuring reserve-current	1,802	1,297
Deferred license fees	1,362	1,362
Marketing accrual	2,063	2,102
Miscellaneous and other expenses accrued at year-end	2,911	3,599
Accrued liabilities and other	11,060	12,175
Accumulated other comprehensive income
Foreign currency translation	677	572
Unrealized investment gain, net of tax		11
Accumulated other comprehensive income	677	583
Land
Schedule of Condensed Consolidating Balance Sheets [Line Items]
Property plant and equipment gross	354	354
Building And Improvement
Schedule of Condensed Consolidating Balance Sheets [Line Items]
Property plant and equipment gross	5,906	5,815
Leasehold Improvements
Schedule of Condensed Consolidating Balance Sheets [Line Items]
Property plant and equipment gross	14,504	17,283
Furniture and fixtures
Schedule of Condensed Consolidating Balance Sheets [Line Items]
Property plant and equipment gross	4,008	4,114
Medical equipment
Schedule of Condensed Consolidating Balance Sheets [Line Items]
Property plant and equipment gross	40,173	42,869
Subtotal
Schedule of Condensed Consolidating Balance Sheets [Line Items]
Property plant and equipment gross	$ 64,945	$ 70,435