6. FAIR VALUE OF FINANCIAL INSTRUMENTS (Detail) - (Table 1) Fair Value of Financial Instruments (USD $)	Jun. 30, 2013	Dec. 31, 2012
Estimate Of Fair Value, Fair Value Disclosure
Cash equivalents:
U.S. Treasury bills	$ 21,553,000
Money market mutual funds	1,144,000	783,000
Time deposits	55,000	54,000
Marketable securities:
Marketable equity securities	1,932,000	1,496,000
Corporate debt securities	1,067,000	662,000
Total assets	25,751,000	2,995,000
Fair Value, Inputs, Level 1
Cash equivalents:
U.S. Treasury bills	21,553,000
Money market mutual funds	1,144,000	783,000
Marketable securities:
Marketable equity securities	1,932,000	1,496,000
Total assets	24,629,000	2,279,000
Fair Value, Inputs, Level 2
Cash equivalents:
Time deposits	55,000	54,000
Marketable securities:
Corporate debt securities	1,067,000	662,000
Total assets	$ 1,122,000	$ 716,000