Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Detail)

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Stockholders' Equity (Detail) - USD ($)
$ / shares in Units, $ in Millions
Dec. 31, 2016
Dec. 31, 2015
Class of Stock [Line Items]    
Common Stock, shares authorized 120,000,000 120,000,000
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock authorized 10,000,000 10,000,000
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock issued 0 0
Preferred stock outstanding 0 0
Restricted Stock Awards [Member]    
Class of Stock [Line Items]    
Unrecognized compensation of unvested awards $ 9.2