Fair Value Measurements (Details) (Recurring basis, USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Quoted Prices in Active Markets (Level 1)
Assets:
Money market funds		$ 4,004
Marketable equity securities	1,060	337
Total	1,060	4,341
Significant Other Observable Inputs (Level 2)
Assets:
Currency forward derivatives/options	267	445
Total	267	445
Significant Unobservable Inputs (Level 3)
Assets:
Springbox revenue sharing	512	768
Total	512	768
Liabilities:
Revenue earnout	855	2,857
Total Fair Value Measurements
Assets:
Money market funds		4,004
Currency forward derivatives/options	267	445
Springbox revenue sharing	512	768
Marketable equity securities	1,060	337
Total	1,839	5,554
Liabilities:
Revenue earnout	$ 855	$ 2,857