Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Restricted Stock Activity (Detail)

v3.5.0.2
Stockholders' Equity - Restricted Stock Activity (Detail) - Restricted Stock [Member]
6 Months Ended
Jun. 30, 2016
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of shares, Unvested balance | shares 8,757,935
Number of shares, Restricted stock granted | shares 1,240,868
Number of shares, Restricted units cancelled | shares (33,333)
Number of shares, Restricted stock vested | shares (173,333)
Number of shares, Restricted stock units granted | shares 405,000
Number of shares, Restricted stock units cancelled | shares (101,000)
Number of shares, Restricted stock units vested | shares (16,917)
Number of shares, Unvested balance | shares 10,079,220
Weighted average grant price, Unvested balance | $ / shares $ 2.47
Weighted average grant price, Restricted stock granted | $ / shares 2.77
Weighted average grant price, Restricted stock cancelled | $ / shares 2.69
Weighted average grant price, Restricted stock vested | $ / shares 2.73
Weighted average grant price, Restricted stock units granted | $ / shares 2.9
Weighted average grant price, Restricted stock units cancelled | $ / shares 3.64
Weighted average grant price, Restricted stock units vested | $ / shares 3.55
Weighted average grant price, Unvested balance | $ / shares $ 2.5