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Stock-Based Compensation - Summary of RSU Activity (Detail) - RSUs [Member]
9 Months Ended
Sep. 30, 2018
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of Shares Outstanding, Beginning Balance | shares 12,026
Number of Shares, Granted | shares 0
Number of share, Vested and issued | shares (5,833)
Number of share, Forfeited | shares (5,833)
Number of Shares Outstanding, Ending Balance | shares 360
Number of Shares, Vested and unvested expected to vest, Ending Balance | shares 360
Weighted Average Grant Date Fair Value, Outstanding, Beginning Balance | $ / shares $ 56.10
Weighted Average Grant Date Fair Value, Granted | $ / shares 0
Weighted Average Grant Date Fair Value, Vested and issued | $ / shares 45.00
Weighted Average Grant Date Fair Value, Forfeited | $ / shares 45.00
Weighted Average Grant Date Fair Value, Outstanding, Ending Balance | $ / shares 415.80
Weighted Average Grant Date Fair Value, Vested and unvested expected to vest, Ending Balance | $ / shares $ 415.80