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Income Taxes - Reconciliation of Income Taxes Computed at Statutory Rate (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Federal provision at statutory rate $ 5,887 $ 4,466 $ (5,176)
U.S./foreign tax rate differential 1 (991) (809)
Foreign non-deductible expenses (479) 1,556 1,174
Foreign tax provision 296 361 114
State taxes, net of federal benefit 588 1,799 1,009
Change in uncertain tax positions 236 (150) (253)
Change in valuation allowance 3,283 (2,538) 856
Tax credits (283) (91) (326)
Share-based compensation 459 377 636
Other (230) 342 438
Provision (benefit) for income taxes $ 9,758 $ 5,131 $ (2,337)