Fair Value Measurement (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Mar. 31, 2012
Cash equivalents:
Money market funds	$ 14,373		$ 14,366
Short-term investments:
Mutual funds (1)	1,965	[1]	1,942	[1]
Total	16,338		16,308
Quoted Prices in Active Markets for Identical Assets (Level 1)
Cash equivalents:
Money market funds	14,373		14,366
Short-term investments:
Mutual funds (1)	0	[1]	0	[1]
Total	14,373		14,366
Other Observable Inputs (Level 2)
Cash equivalents:
Money market funds	0		0
Short-term investments:
Mutual funds (1)	1,965	[1]	1,942	[1]
Total	1,965		1,942
Significant Unobservable Inputs (Level 3)
Cash equivalents:
Money market funds	0		0
Short-term investments:
Mutual funds (1)	0	[1]	0	[1]
Total	$ 0		$ 0

[1] The fair value of mutual funds is determined based on published net asset values. The Company uses such pricing data as the primary input to make its assessments and determinations as to the ultimate valuation of its investment portfolio.