Quarterly report pursuant to Section 13 or 15(d)

Common Stock - Summary of Common Stock Shares Activity (Detail)

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Common Stock - Summary of Common Stock Shares Activity (Detail) - shares
3 Months Ended 6 Months Ended
Apr. 28, 2015
May. 07, 2014
Mar. 31, 2015
Jun. 30, 2015
Equity [Abstract]        
Beginning Balance     8,512,103 8,512,103
Common stock issued through April 2015 Offering 5,376,622 6,200,000   5,376,622
Common stock issued through employee stock purchase plan     15,107 15,107
Ending Balance       13,903,832