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Consolidated Deferred Tax Assets (Liabilities) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Temporary timing differences:    
Stock compensation $ 1,662 $ 1,722
Contingent consideration 2,196 3,333
Other 1,704 1,895
Total temporary timing differences 5,562 6,950
Net operating loss carryforwards 4,361 12,284
Tax business credits carryforwards 1,265 2,036
Total deferred tax assets 11,188 21,270
Valuation allowance (6) (9,979)
Net deferred tax assets 11,182 11,291
Deferred tax liabilities:    
Goodwill and intangible assets (33,166) (7,346)
Conversion option on convertible notes (3,183) (6,048)
Total deferred tax liabilities (36,349) (13,394)
Net deferred tax liabilities $ (25,167) $ (2,103)