Quarterly report pursuant to Section 13 or 15(d)

Common Stock - Summary of Restricted Stock Unit Award Activity (Detail)

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Common Stock - Summary of Restricted Stock Unit Award Activity (Detail) - 6 months ended Jun. 30, 2015 - Restricted Stock Unit [Member] - $ / shares
Total
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Beginning Balance 680,201
Number of Shares, Granted 227,150
Number of Shares, Settled (253,538)
Number of Shares, Forfeited or expired (19,816)
Number of Shares, Ending Balance 633,997
Weighted-Average Grant Date Fair Value, Beginning Balance $ 7.34
Weighted-Average Grant Date Fair Value, Granted 1.74
Weighted-Average Grant Date Fair Value, Settled 8.32
Weighted-Average Grant Date Fair Value, Forfeited or expired 7.27
Weighted-Average Grant Date Fair Value, Ending Balance $ 4.95