Stock-Based Compensation - Stock Option Activity under All Plans and Other Grants (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended	12 Months Ended
	Dec. 31, 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	(97,167)
Number of Shares, Canceled or expired	(329,785)
Number of Shares, Outstanding, Ending Balance	962,546	1,231,498
Number of Shares, Options exercisable at December 31, 2013	431,545
Number of Shares, Unvested options expected to become exercisable after December 31, 2013	531,001
Number of Shares, Shares available for future option grants at December 31, 2013	505,113
Aggregate Intrinsic Value, Outstanding, Beginning Balance	$ 720
Aggregate Intrinsic Value, Granted
Aggregate Intrinsic Value, Exercised	170
Aggregate Intrinsic Value, Canceled or expired
Aggregate Intrinsic Value, Outstanding, Ending Balance	1,054	720
Average Intrinsic Value, Options exercisable at December 31, 2013	548
Aggregate Intrinsic Value, Unvested options expected to become exercisable after December 31, 2013	$ 506
Approximate Remaining Contractual Term, Outstanding	8 years	7 years
Approximate Remaining Contractual Term, Granted	10 years
Approximate Remaining Contractual Term, Options exercisable at December 31, 2013	6 years
Approximate Remaining Contractual Term, Unvested options expected to become exercisable after December 31, 2013	9 years
Weighted-Average Exercise Price Outstanding, Beginning Balance	$ 8.20
Weighted-Average Exercise Price, Granted	$ 8.58
Weighted-Average Exercise Price, Exercised	$ 6.96
Weighted-Average Exercise Price, Canceled or expired	$ 8.32
Weighted-Average Exercise Price, Outstanding, Ending Balance	$ 8.34	$ 8.20
Weighted-Average Exercise Price, Options exercisable at December 31, 2013	$ 8.44
Weighted-Average Exercise Price, Unvested options expected to become exercisable after December 31, 2013	$ 8.26