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Shareholders' Equity - Summary of Restricted Stock Unit Activity (Detail) (Restricted Stock Units (RSUs) [Member], USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Restricted Stock Units (RSUs) [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unvested, Number of Shares, Beginning Balance 236,513 241,248
Unvested, Weighted Average Exercise Price, Beginning Balance $ 4.95 $ 5.91
Granted, Number of Shares 128,838 177,592
Vested, Number of Shares (171,404) (148,743)
Forfeited, Number of Shares (6,565) (33,584)
Unvested, Number of Shares, Ending Balance 187,382 236,513
Expected to vest, Number of Shares, Ending Balance 172,790  
Granted, Weighted Average Exercise Price $ 2.75 $ 3.49
Vested, Weighted Average Exercise Price $ 3.82 $ 4.98
Forfeited, Weighted Average Exercise Price $ 6.80 $ 6.07
Unvested, Weighted Average Exercise Price, Ending Balance $ 4.40 $ 4.95
Expected to vest, Weighted Average Exercise Price, Ending Balance $ 4.23