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Summary of Restricted Stock Award Activity (Detail)
9 Months Ended
Sep. 30, 2015
$ / shares
shares
Number of Shares  
Outstanding at beginning of period | shares 568,057
Awarded | shares 734,822
Released | shares (80,794)
Forfeited | shares (42,930)
Outstanding at end of period | shares 1,179,155
Weighted Average Grant Price  
Outstanding at beginning of period $ 6.54
Awarded 5.41
Released 7.10
Forfeited 6.32
Outstanding at end of period $ 5.80