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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 20,215us-gaap_CashAndCashEquivalentsAtCarryingValue $ 20,158us-gaap_CashAndCashEquivalentsAtCarryingValue
Short-term investments 63,013us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent 57,570us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent
Related party accounts receivable 46,646us-gaap_AccountsReceivableRelatedPartiesCurrent 5us-gaap_AccountsReceivableRelatedPartiesCurrent
Prepaid and other current assets 1,257us-gaap_OtherAssetsCurrent 1,605us-gaap_OtherAssetsCurrent
Total current assets 131,131us-gaap_AssetsCurrent 79,338us-gaap_AssetsCurrent
Property and equipment, net 1,637us-gaap_PropertyPlantAndEquipmentNet 1,221us-gaap_PropertyPlantAndEquipmentNet
Long-term investments 0us-gaap_LongTermInvestments 2,502us-gaap_LongTermInvestments
Other assets 200us-gaap_OtherAssetsNoncurrent 127us-gaap_OtherAssetsNoncurrent
Total assets 132,968us-gaap_Assets 83,188us-gaap_Assets
Current liabilities:    
Accounts payable 1,361us-gaap_AccountsPayableCurrent 3,709us-gaap_AccountsPayableCurrent
Accrued liabilities 5,400us-gaap_AccruedLiabilitiesCurrent 8,272us-gaap_AccruedLiabilitiesCurrent
Deferred revenue, current 17,042us-gaap_DeferredRevenueCurrent 14,701us-gaap_DeferredRevenueCurrent
Short-term portion of deferred rent 52us-gaap_DeferredRentCreditCurrent 22us-gaap_DeferredRentCreditCurrent
Total current liabilities 23,855us-gaap_LiabilitiesCurrent 26,704us-gaap_LiabilitiesCurrent
Deferred revenue, non-current 16,558us-gaap_DeferredRevenueNoncurrent 1,500us-gaap_DeferredRevenueNoncurrent
Long-term portion of deferred rent 491us-gaap_DeferredRentCreditNoncurrent 542us-gaap_DeferredRentCreditNoncurrent
Total liabilities 40,904us-gaap_Liabilities 28,746us-gaap_Liabilities
Commitments and contingencies (Note 10)      
Stockholders' equity:    
Common stock, $0.001 par value: Authorized: 81,500,000 shares: Issued and outstanding: 38,659,738 shares at December 31, 2014 and 30,681,624 shares at December 31, 2013 39us-gaap_CommonStockValue 31us-gaap_CommonStockValue
Additional paid-in capital 589,272us-gaap_AdditionalPaidInCapital 537,001us-gaap_AdditionalPaidInCapital
Accumulated other comprehensive income (4)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 7us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Accumulated deficit (497,243)us-gaap_RetainedEarningsAccumulatedDeficit (482,597)us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity 92,064us-gaap_StockholdersEquity 54,442us-gaap_StockholdersEquity
Total liabilities and stockholders' equity 132,968us-gaap_LiabilitiesAndStockholdersEquity 83,188us-gaap_LiabilitiesAndStockholdersEquity
Series A Convertible Preferred Stock [Member]    
Stockholders' equity:    
Preferred stock, value $ 0us-gaap_PreferredStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
$ 0us-gaap_PreferredStockValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember