6. FAIR VALUE OF FINANCIAL INSTRUMENTS (Detail) - (Table 1) Fair Value of Financial Instruments (USD $)	Mar. 31, 2013	Dec. 31, 2012
Estimate Of Fair Value, Fair Value Disclosure
Cash equivalents:
U.S. Treasury bills	$ 18,951,000
Money market mutual funds	4,189,000	783,000
Time deposits	55,000	54,000
Marketable securities:
Marketable equity securities	1,844,000	1,497,000
Corporate debt securities	675,000	662,000
Total assets	25,714,000	2,996,000
Fair Value, Inputs, Level 1
Cash equivalents:
U.S. Treasury bills	18,951,000
Money market mutual funds	4,189,000	783,000
Time deposits
Marketable securities:
Marketable equity securities	1,844,000	1,497,000
Corporate debt securities
Total assets	24,984,000	2,280,000
Fair Value, Inputs, Level 2
Cash equivalents:
U.S. Treasury bills
Money market mutual funds
Time deposits	55,000	54,000
Marketable securities:
Marketable equity securities
Corporate debt securities	675,000	662,000
Total assets	$ 730,000	$ 716,000