Fair Value Measurements (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013
Assets:
Total assets	$ 13,370
Liabilities:
Contingent acquisition consideration	2,147
Total liabilities	2,147
Money market funds [Member]
Assets:
Cash equivalents	1,377
Commercial paper [Member]
Assets:
Cash equivalents	4,550
Corporate bonds [Member]
Assets:
Cash equivalents	7,443
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets:
Total assets	1,377
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Money market funds [Member]
Assets:
Cash equivalents	1,377
Significant Other Observable Inputs (Level 2) [Member]
Assets:
Total assets	11,993
Significant Other Observable Inputs (Level 2) [Member] | Commercial paper [Member]
Assets:
Cash equivalents	4,550
Significant Other Observable Inputs (Level 2) [Member] | Corporate bonds [Member]
Assets:
Cash equivalents	7,443
Significant Unobservable Inputs (Level 3) [Member]
Liabilities:
Contingent acquisition consideration	2,147
Total liabilities	$ 2,147