Stockholders' Equity - Summary of Employee and Non-Employee Stock Options Activity (Detail) - USD ($)	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options, Outstanding (in shares)	366,549
Options, Granted (in shares)	9,703	0
Options, Exercised (in shares)	0
Options, Canceled/forfeited (in shares)	(24,244)
Options, Outstanding (in shares)	352,008	366,549
Options, Exercisable at March 31, 2016 (in shares)	282,005
Options, Fully vested and expected to vest at March 31, 2016 (in shares)	347,256
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted-Average Exercise Price, Outstanding (in dollars per share)	$ 83.39
Weighted-Average Exercise Price, Granted (in dollars per share)	6.80
Weighted-Average Exercise Price, Exercised (in dollars per share)	0.00
Weighted-Average Exercise Price, Cancelled/Forfeited (in dollars per share)	107.26
Weighted-Average Exercise Price, Outstanding (in dollars per share)	79.63	$ 83.39
Weighted-Average Exercise Price, Exercisable at March 31, 2017 (in dollars per share)	96.09
Weighted-Average Exercise Price, Fully vested and expected to vest at March 31, 2017 (in dollars per share)	$ 80.54
Weighted-Average Remaining Contractual Term, Outstanding at March 31, 2016	5 years 20 days
Weighted-Average Remaining Contractual Term, Exercisable at March 31, 2016	5 years 8 days
Weighted-Average Remaining Contractual Term, Fully vested and expected to vest at March 31, 2016	4 years 5 months 20 days
Aggregate Intrinsic Value, Outstanding at March 31, 2017	$ 600
Aggregate Intrinsic Value, Exercisable at March 31, 2017	0	$ 0	$ 0
Aggregate Intrinsic Value, Fully vested and expected to vest at March 31, 2017	$ 500