Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]    
Net operating loss carryforwards $ 2,375 $ 3,222
Deferred revenue 627 1,715
Amortization 1,211 897
Research and development credit carryforwards 404 383
Bad debt reserves 56 71
Stock compensation associated with non-qualified awards 10,423 8,242
Depreciation 326   
Other 2,369 2,136
Total deferred tax assets 17,791 16,666
Deferred tax asset valuation allowance (2,836) (2,463)
Net deferred tax assets 14,955 14,203
Depreciation (1,212) (313)
Goodwill amortization (1,236) (655)
Other (14)   
Total deferred tax liabilities (2,462) (968)
Total $ 12,493 $ 13,235