FAIR VALUE MEASUREMENTS AND INVESTMENTS (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Assets:
Available for sale marketable equity securities	$ 1,200
Recurring basis | Quoted Prices in Active Markets (Level 1)
Assets:
Money market funds	49,931	36,537
Available for sale marketable equity securities	975
Total	50,906	36,537
Recurring basis | Significant Other Observable Inputs (Level 2)
Assets:
Equity securities-restricted stock		300
Put/call option on equity securities		200
Total		500
Liabilities:
Currency forward derivative	426
Total	426
Recurring basis | Significant Unobservable Inputs (Level 3)
Assets:
Contingent receivable from EyeWonder seller	4,843
Total	4,843
Liabilities:
Total	1,807
Recurring basis | Significant Unobservable Inputs (Level 3) | Match Point Earnout
Liabilities:
Contingent consideration at fair value	1,807	1,602
Recurring basis | Total Fair Value Measurements
Assets:
Money market funds	49,931	36,537
Contingent receivable from EyeWonder seller	4,843
Available for sale marketable equity securities	975
Equity securities-restricted stock		300
Put/call option on equity securities		200
Total	55,749	37,037
Liabilities:
Currency forward derivative	426
Total	2,233
Recurring basis | Total Fair Value Measurements | Match Point Earnout
Liabilities:
Contingent consideration at fair value	$ 1,807	$ 1,602