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Stockholders' Equity/(Deficit) - Summary of Stock Option Activity (Detail) - $ / shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Equity [Abstract]      
Number of Shares, Outstanding, Beginning 332,415 375,283 307,791
Number of Shares, Granted   22,493 137,667
Number of Shares, Exercised 0 0 0
Number of Shares, Cancelled (84,598) (65,361) (70,174)
Number of Shares, Outstanding, Ending 247,817 332,415 375,283
Weighted Average Exercise Price Outstanding, Beginning $ 21.55 $ 32.04 $ 32.04
Number of Shares, Options exercisable 247,817 300,751 275,735
Weighted Average Exercise Price, Granted   $ 2.74 $ 12.48
Weighted Average Exercise Price, Exercised $ 0 0 0
Weighted Average Exercise Price, Cancelled 35.59 32.82 32.88
Weighted Average Exercise Price, Outstanding, Ending 16.76 21.55 32.04
Weighted Average Exercise Price, Options exercisable $ 16.76 $ 22.30 $ 27.48