EARNINGS PER COMMON SHARE (Details) (USD $)	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
EARNINGS PER COMMON SHARE [Abstract]
Conversion value of notes to invoke inclusion in dilutive securities incremental shares issuable	$ 1,000
Net income	$ 10,842,000		$ 3,108,000
Net income per share [Abstract]
Basic (in dollars per share)	$ 0.11		$ 0.03
Diluted (in dollars per share)	$ 0.10		$ 0.03
Shares used in computing net income per share [Abstract]
Weighted average basic shares outstanding (in shares)	95,926,000		95,011,000
Dilutive securities [Abstract]
Stock options and unvested RSAs (in shares)	4,193,000		4,097,000
Stock warrants (in shares)	6,589,000		6,502,000
Shares issuable upon conversion of convertible notes (in shares)	4,843,000	[1]	3,559,000	[1]
Total dilutive securities (in shares)	15,625,000		14,158,000
Weighted average diluted shares outstanding (in shares)	111,551,000		109,169,000
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share calculation (in shares)	1,496,000		126,000
Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share calculation (in shares)	0		0

[1] Shares issuable upon conversion of convertible notes assumes that that Company would repay the principal of the notes in cash and pay any incremental value in shares of the Company's common stock.