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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 4) (USD $)
In Thousands, except Per Share data, unless otherwise specified
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3 Months Ended |
12 Months Ended |
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Dec. 31, 2014
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Sep. 30, 2014
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Jun. 30, 2014
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Mar. 31, 2014
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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| EPS Numerator: |
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| Net loss |
$ (22,272)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
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$ (20,942)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
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$ (25,391)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
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$ (22,303)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
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$ (16,861)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
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$ (23,824)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
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$ (22,768)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
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$ (25,574)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
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$ (90,908)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
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$ (89,027)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
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$ (98,840)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
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| EPS Denominator - Basic: |
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| Weighted-average common shares outstanding |
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87,662us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
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87,288us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
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74,967us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
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| EPS Denominator - Diluted: |
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| Weighted-average common shares outstanding |
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87,662us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
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87,288us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
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74,967us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
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| Weighted-average shares outstanding and common stock equivalents |
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87,662us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
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87,288us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
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74,967us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
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| Net loss per common share: |
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| Basic and diluted (in dollars per share) |
$ (0.25)us-gaap_EarningsPerShareBasicAndDiluted
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$ (0.24)us-gaap_EarningsPerShareBasicAndDiluted
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$ (0.29)us-gaap_EarningsPerShareBasicAndDiluted
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$ (0.25)us-gaap_EarningsPerShareBasicAndDiluted
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$ (0.19)us-gaap_EarningsPerShareBasicAndDiluted
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$ (0.27)us-gaap_EarningsPerShareBasicAndDiluted
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$ (0.26)us-gaap_EarningsPerShareBasicAndDiluted
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$ (0.29)us-gaap_EarningsPerShareBasicAndDiluted
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$ (1.04)us-gaap_EarningsPerShareBasicAndDiluted
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$ (1.02)us-gaap_EarningsPerShareBasicAndDiluted
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$ (1.32)us-gaap_EarningsPerShareBasicAndDiluted
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| Weighted Average [Member] |
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| Antidilutive securities excluded from the computation of diluted net loss per share |
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| Weighted average exercise price of options (in dollars per share) |
$ 9.07us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
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$ 10.55us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
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$ 9.07us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
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$ 10.55us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
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$ 11.52us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
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| Weighted average exercise price of warrant (in dollars per share) |
$ 6.61us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
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$ 6.61us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
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$ 6.61us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
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$ 6.61us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
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$ 6.61us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember
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| Employee Stock Option [Member] |
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| Antidilutive securities excluded from the computation of diluted net loss per share |
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| Antidilutive securities excluded from computation of earnings per share (in shares) |
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16,971us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember
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15,532us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember
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13,604us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_EmployeeStockOptionMember
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| Warrant [Member] |
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| Antidilutive securities excluded from the computation of diluted net loss per share |
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| Antidilutive securities excluded from computation of earnings per share (in shares) |
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200us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_WarrantMember
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200us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_WarrantMember
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200us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_WarrantMember
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