Stock-Based Compensation - Stock Option Activity under All Plans and Other Grants (Detail) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended	12 Months Ended
		Jun. 30, 2015	Mar. 31, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Shares, Outstanding, Beginning Balance		1,155,999
Number of Shares, Granted		70,000	440,000
Number of Shares, Exercised		(34,500)
Number of Shares, Canceled or expired		(36,000)
Number of Shares, Outstanding, Ending Balance		1,155,499	1,155,999
Number of Shares, Options exercisable at June 30, 2015		631,000
Number of Shares, Unvested options expected to become exercisable after June 30, 2015		524,499
Number of Shares, Shares available for future option grants at June 30, 2015	[1]	234,254
Aggregate Intrinsic Value, Outstanding, Beginning Balance		$ 1,480
Aggregate Intrinsic Value, Exercised		75
Aggregate Intrinsic Value, Outstanding, Ending Balance		2,479	$ 1,480
Aggregate Intrinsic Value, Options exercisable at June 30, 2015		1,748
Aggregate Intrinsic Value, Unvested options expected to become exercisable after June 30, 2015		$ 730
Approximate Remaining Contractual Term, Outstanding		8 years	8 years
Approximate Remaining Contractual Term, Granted		10 years
Approximate Remaining Contractual Term, Options exercisable at June 30, 2015		7 years
Approximate Remaining Contractual Term, Unvested options expected to become exercisable after June 30, 2015		9 years
Weighted-Average Exercise Price Outstanding, Beginning Balance		$ 9.26
Weighted-Average Exercise Price, Granted		10.41
Weighted-Average Exercise Price, Exercised		8.07
Weighted-Average Exercise Price, Canceled or expired		8.61
Weighted-Average Exercise Price, Outstanding, Ending Balance		9.58	$ 9.26
Weighted-Average Exercise Price, Options exercisable at June 30, 2015		8.84
Weighted-Average Exercise Price, Unvested options expected to become exercisable after June 30, 2015		$ 10.47

[1] May be decreased by restricted stock grants.