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Note 4 - Balance Sheet Details (Details) - Acrued Expenses (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Acrued Expenses [Abstract]    
Accrued employee salaries and benefits $ 719us-gaap_AccruedSalariesCurrent $ 796us-gaap_AccruedSalariesCurrent
Accrued bonuses 2,012us-gaap_AccruedBonusesCurrent 1,770us-gaap_AccruedBonusesCurrent
Total accrued payroll and employee liabilities 2,731us-gaap_EmployeeRelatedLiabilitiesCurrent 2,566us-gaap_EmployeeRelatedLiabilitiesCurrent
Accrued professional fees 1,775us-gaap_AccruedProfessionalFeesCurrent 69us-gaap_AccruedProfessionalFeesCurrent
Accrued accounts payable 886us-gaap_AccountsPayableOtherCurrent 26us-gaap_AccountsPayableOtherCurrent
Deferred rent 105us-gaap_AccruedRentCurrent 131us-gaap_AccruedRentCurrent
Other accrued liabilities 165us-gaap_OtherSundryLiabilitiesCurrent 138us-gaap_OtherSundryLiabilitiesCurrent
Total other accrued expense $ 2,931us-gaap_OtherAccruedLiabilitiesCurrent $ 364us-gaap_OtherAccruedLiabilitiesCurrent