Stock-Based Compensation - Stock Option Activity under All Plans and Other Grants (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Jun. 30, 2013	Mar. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Shares, Outstanding, Beginning Balance	1,231,498
Number of Shares, Granted	158,000	551,000
Number of Shares, Exercised	(49,167)
Number of Shares, Canceled or expired	(108,667)
Number of Shares, Outstanding, Ending Balance	1,231,664	1,231,498
Number of Shares, Options exercisable at June 30, 2013	602,997
Number of Shares, Unvested options expected to become exercisable after June 30, 2013	628,667
Number of Shares, Shares available for future option grants at June 30, 2013	428,477
Aggregate Intrinsic Value, Outstanding, Beginning Balance	$ 720
Aggregate Intrinsic Value, Granted
Aggregate Intrinsic Value, Exercised	91
Aggregate Intrinsic Value, Canceled or expired
Aggregate Intrinsic Value, Outstanding, Ending Balance	1,093	720
Aggregate Intrinsic Value, Options exercisable at June 30, 2013	764
Aggregate Intrinsic Value, Unvested options expected to become exercisable after June 30, 2013	$ 329
Approximate Remaining Contractual Term, Granted	10 years
Approximate Remaining Contractual Term, Outstanding	8 years	7 years
Approximate Remaining Contractual Term, Options exercisable at June 30, 2013	6 years
Approximate Remaining Contractual Term, Unvested options expected to become exercisable after June 30, 2013	9 years
Weighted-Average Exercise Price Outstanding, Beginning Balance	$ 8.20
Weighted-Average Exercise Price, Granted	$ 8.58
Weighted-Average Exercise Price, Exercised	$ 6.80
Weighted-Average Exercise Price, Canceled or expired	$ 9.08
Weighted-Average Exercise Price, Outstanding, Ending Balance	$ 8.22	$ 8.20
Weighted-Average Exercise Price, Options exercisable at June 30, 2013	$ 8.17
Weighted-Average Exercise Price, Unvested options expected to become exercisable after March 31, 2013	$ 8.28