ACCOUNTS RECEIVABLE (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Less:
Allowance for doubtful accounts	$ 1,444,000	$ 1,517,000	$ 2,401,000
Allowance for sales returns and rebates	12,519,000	19,460,000	22,767,000	23,658,000
Accounts receivable, net	56,770,000	67,956,000
Trade Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	70,733,000	88,933,000
Less:
Allowance for doubtful accounts	(1,444,000)	(1,517,000)
Allowance for sales returns and rebates	(12,519,000)	(19,460,000)
Large solution sales and certain distributor sales excluded from accounts receivable	$ 8,600,000	$ 7,600,000