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STOCKHOLDERS' EQUITY: (Details) (USD $)
9 Months Ended
Sep. 30, 2013
Number of Options, Outstanding at December 31, 2012 4,630,000
Number of Options, Grants 0
Number of Options, Exercised 0
Number Of Option, Forfeited/cancelled/expired 55,000
Number of Options, Balance as of September 30, 2013 4,575,000
Number of Options, Vested and expected to vest at September 30, 2013 4,566,000
Number of Options, Unvested at September 30, 2013 75,000
Number of Options, Exercisable at September 30, 2013 4,500,000
Weighted-Average Exercise Price, Outstanding at December 31, 2012 $ 8.17
Weighted-Average Exercise Price, Grants $ 0
Weighted-Average Exercise Price, Exercised $ 0
Weighted-Average Exercise Price, Forfeited/cancelled/expired $ 15.30
Weighted-Average Exercise Price, Balance as of September 30, 2013 $ 8.08
Weighted-Average Exercise Price, Vested and expected to vest at September 30, 2013 $ 8.10
Weighted-Average Exercise Price, Unvested at September 30, 2013 $ 0.83
Weighted-Average Exercise Price, Exercisable at September 30, 2013 $ 8.21
Weighted-Average Remaining Contractual Term, Balance as of September 30, 2013 (in years) 3 years 22 days
Weighted-Average Remaining Contractual Term, Vested and expected to vest at September 30, 2013 (in years) 3 years 18 days
Weighted-Average Remaining Contractual Term, Unvested at September 30, 2013 (in years) 8 years 8 months 5 days
Weighted-Average Remaining Contractual Term, Exercisable at September 30, 2013 (in years) 2 years 11 months 19 days
Aggregate Intrinsic Value, Outstanding at December 31, 2012 $ 0
Aggregate Intrinsic Value, Balance as of September 30, 2013 2,908,491
Aggregate Intrinsic Value, Vested and expected to vest at September 30, 2013 2,891,422
Aggregate Intrinsic Value, Unvested at September 30, 2013 140,058
Aggregate Intrinsic Value, Exercisable at September 30, 2013 $ 2,768,433