ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Numerator:
Net loss attributable to common stockholders	$ (25,183)	$ (18,106)
Denominator:
Denominator for basic net loss per share - weighted-average outstanding shares (in shares)	47,441,175	49,861,964
Effect of dilutive securities:
Stock options and restricted stock (in shares)	0	0
Denominator for diluted net loss per share - weighted-average outstanding shares (in shares)	47,441,175	49,861,964
Net loss attributable to common stockholders per share - basic and diluted (in dollars per share)	$ (0.53)	$ (0.38)