Stockholders' Equity - Summary of Employee and Non-Employee Stock Options Activity (Detail) - USD ($)	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Options / Shares
Options, Outstanding (in shares)	352,008
Options, Granted (in shares)	0	9,703	0
Options, Exercised (in shares)	0
Options, Canceled/forfeited (in shares)	(71,117)
Options, Outstanding (in shares)	280,891	352,008
Options, Exercisable at March 31, 2018 (in shares)	236,040
Options, Fully vested and expected to vest at March 31, 2018 (in shares)	279,465
Weighted- Average Exercise Price
Weighted-Average Exercise Price, Outstanding (in dollars per share)	$ 79.63
Weighted-Average Exercise Price, Granted (in dollars per share)	0.00
Weighted-Average Exercise Price, Exercised (in dollars per share)	0.00
Weighted-Average Exercise Price, Cancelled/Forfeited (in dollars per share)	119.64
Weighted-Average Exercise Price, Outstanding (in dollars per share)	69.51	$ 79.63
Weighted-Average Exercise Price, Exercisable at March 31, 2018 (in dollars per share)	80.15
Weighted-Average Exercise Price, Fully vested and expected to vest at March 31, 2018 (in dollars per share)	$ 69.79
Weighted-Average Remaining Contractual Term, Outstanding at March 31, 2018	4 years 7 months
Weighted-Average Remaining Contractual Term, Exercisable at March 31, 2018	4 years 3 months
Weighted-Average Remaining Contractual Term, Fully vested and expected to vest at March 31, 2018	4 years 7 months
Aggregate Intrinsic Value, Outstanding at March 31, 2018	$ 0
Aggregate Intrinsic Value, Exercisable at March 31, 2018	0	$ 0	$ 0
Aggregate Intrinsic Value, Fully vested and expected to vest at March 31, 2018	$ 0