Quarterly report pursuant to Section 13 or 15(d)

Schedule of Changes in Common Stock Outstanding (Parenthetical) (Detail)

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Schedule of Changes in Common Stock Outstanding (Parenthetical) (Detail) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2016
May 31, 2016
Jun. 30, 2016
Sep. 30, 2016
Sep. 30, 2015
Class of Stock [Line Items]          
Offering price of common stock $ 5.25   $ 5.25    
Issuance of common stock, net of issuance fees   $ 15,200 $ 15,200 $ 16,192 $ 9,525
Issuance of common stock in a private placement $ 1,000   $ 1,000