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Reconciliation of Federal Income Tax Rate (Detail) (USD $)
In Thousands, unless otherwise specified
6 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2009
Income Tax [Line Items]          
Tax computed at the federal statutory rate $ (1,907) $ 1,857 $ 3,799 $ (10,005) $ (1,991)
State taxes, net of federal benefit 82 122 250 (359) (312)
Tax rate differential for international subsidiaries 1,589 [1] (23) [1] (47) [1] (13) [1] (1) [1]
Stock-based compensation 978 244 727 149 50
Tax credits (378) (150) (409) (282) (677)
Tax contingencies 178 74 171 265 194
Permanent differences 244 120 305 411 226
Change in state rate 8 295 662 (1,170) 32
Other 146 379 344 117 (15)
Valuation allowance 135 (2,265) (4,466) 11,167 2,542
Provision for income taxes $ 1,075 $ 653 $ 1,336 $ 280 $ 48
[1] The change in the impact of the tax rate differential for international jurisdictions is primarily attributable to a change in the mix of income/loss from the United States to international jurisdictions with different income tax rates compared to the United States.