ORGANIZATION AND ACCOUNTING POLICIES (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2012 item	Dec. 31, 2011	Dec. 31, 2010
Accounts Receivable
Credit period	30 days
Allowance of for doubtful accounts	$ 13,000	$ 13,000
Investments
Number of categories of investment in debt securities	2
Offering Costs
Deferred finance costs, net of accumulated amortization	1,500,000	1,500,000
Accumulated amortization of debt issuance costs	584,000	377,000
Period of accretion of preferred stock to liquidation value	7 years
Stock based compensation
Compensation expense related to stock options and restricted stock awards	$ 2,600,000	$ 1,500,000	$ 2,400,000
Stock options
Weighted-average assumptions used to value stock options
Weighted average volatility (as a percent)	72.00%	75.00%	78.00%
Risk-free interest rate (as a percent)	0.43%	1.26%	1.60%
Expected life	3 years 6 months	3 years 6 months	3 years 6 months
Weighted average fair value (in dollars per share)	$ 1.41	$ 2.04	$ 1.33