XML 13 R53.htm IDEA: XBRL DOCUMENT v2.4.0.8
Share-Based Compensation - Summary of Stock Option Activity (Detail) (USD $)
9 Months Ended
Nov. 02, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Number of Options, Outstanding beginning balance 1,978,931
Number of Options, Granted 736,529
Number of Options, Exercised (52,422)
Number of Options, Forfeited or expired (250,313)
Number of Options, Outstanding ending balance 2,412,725
Number of Options, Vested or expected to vest 739,150
Number of Options, Exercisable 686,728
Weighted Average Exercise Price, Outstanding, Beginning balance $ 4.09
Weighted Average Exercise Price, Granted $ 6.87
Weighted Average Exercise Price, Exercised $ 0.04
Weighted Average Exercise Price, Forfeited or expired $ 4.52
Weighted Average Exercise Price, Outstanding, Ending balance $ 4.98
Weighted Average Exercise Price, Vested or expected to vest $ 1.90
Weighted Average Exercise Price, Exercisable $ 2.04