Fair Value Measurements - Schedule of Financial Assets and Liabilities Measured at Fair Value (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013
Assets:
Total assets	$ 18,501
Liabilities:
Contingent acquisition consideration	2,200
Total liabilities	2,200
Money Market Funds [Member]
Assets:
Cash equivalents	1,852
Commercial Paper [Member]
Assets:
Cash equivalents	15,047
Corporate Bonds [Member]
Assets:
Cash equivalents	1,602
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets:
Total assets	1,852
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Money Market Funds [Member]
Assets:
Cash equivalents	1,852
Significant Other Observable Inputs (Level 2) [Member]
Assets:
Total assets	16,649
Significant Other Observable Inputs (Level 2) [Member] | Commercial Paper [Member]
Assets:
Cash equivalents	15,047
Significant Other Observable Inputs (Level 2) [Member] | Corporate Bonds [Member]
Assets:
Cash equivalents	1,602
Significant Unobservable Inputs (Level 3) [Member]
Liabilities:
Contingent acquisition consideration	2,200
Total liabilities	$ 2,200