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Accrued Liabilities - Schedule of Accrued Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Apr. 30, 2013
Jan. 31, 2013
Payables And Accruals [Abstract]    
Accrued employee compensation $ 5,259 $ 8,599
Refundable exercised unvested options 161 210
Accrued warranty 335 352
Accrued rebates 192 272
Accrued product development costs 3,920 2,875
Other accrued liabilities 1,317 2,111
Total accrued liabilities $ 11,184 $ 14,419