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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Numerator:        
Net loss attributable to common stockholders $ (13,221) $ (13,064) $ (45,541) $ (49,638)
Denominator:        
Denominator for basic net loss per share - weighted average outstanding shares (in shares) 47,443,031 50,019,048 48,680,979 50,010,406
Effect of dilutive securities:        
Stock options and restricted stock (in shares) 0 0 0 0
Denominator for diluted net loss per share - weighted-average outstanding shares (in shares) 47,443,031 50,019,048 48,680,979 50,010,406
Net loss attributable to common stockholders per share - basic (in dollars per share) $ (0.28) $ (0.26) $ (0.95) $ (0.99)
Net loss attributable to common stockholders per share - diluted (in dollars per share) $ (0.28) $ (0.26) $ (0.95) $ (0.99)