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CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Current assets:    
Cash and cash equivalents $ 263,134us-gaap_CashAndCashEquivalentsAtCarryingValue $ 157,591us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable 1,719us-gaap_AccountsReceivableNetCurrent 2,935us-gaap_AccountsReceivableNetCurrent
Prepaid expenses 3,617us-gaap_PrepaidExpenseCurrent 4,211us-gaap_PrepaidExpenseCurrent
Total current assets 268,470us-gaap_AssetsCurrent 164,737us-gaap_AssetsCurrent
Restricted cash 300us-gaap_RestrictedCashAndCashEquivalents 300us-gaap_RestrictedCashAndCashEquivalents
Property and equipment, net 7,236us-gaap_PropertyPlantAndEquipmentNet 6,785us-gaap_PropertyPlantAndEquipmentNet
Other assets 2,064us-gaap_OtherAssetsNoncurrent 2,064us-gaap_OtherAssetsNoncurrent
Total assets 278,070us-gaap_Assets 173,886us-gaap_Assets
Current liabilities:    
Accounts payable 1,444us-gaap_AccountsPayableCurrent 1,669us-gaap_AccountsPayableCurrent
Accrued expenses 7,001us-gaap_AccruedLiabilitiesCurrent 7,930us-gaap_AccruedLiabilitiesCurrent
Lease exit liability 1,696us-gaap_RestructuringReserveCurrent 1,642us-gaap_RestructuringReserveCurrent
Deferred revenue 12,382us-gaap_DeferredRevenueCurrent 14,248us-gaap_DeferredRevenueCurrent
Other liabilities 1,605us-gaap_OtherLiabilitiesCurrent 1,605us-gaap_OtherLiabilitiesCurrent
Total current liabilities 24,128us-gaap_LiabilitiesCurrent 27,094us-gaap_LiabilitiesCurrent
Lease exit liability, net of current portion 5,914us-gaap_RestructuringReserveNoncurrent 6,364us-gaap_RestructuringReserveNoncurrent
Deferred rent liability 2,646us-gaap_DeferredRentCreditNoncurrent 2,670us-gaap_DeferredRentCreditNoncurrent
Deferred revenue, net of current portion 14,389us-gaap_DeferredRevenueNoncurrent 16,472us-gaap_DeferredRevenueNoncurrent
Total liabilities 47,077us-gaap_Liabilities 52,600us-gaap_Liabilities
Stockholders' equity:    
Common stock, $0.01 par value - 125,000,000 shares authorized, 30,024,535 and 27,995,638 shares outstanding at March 31, 2015 and December 31, 2014, respectively 300us-gaap_CommonStockValue 280us-gaap_CommonStockValue
Treasury stock, at cost; 865 shares at March 31, 2015 and December 31, 2014 (19)us-gaap_TreasuryStockValue (19)us-gaap_TreasuryStockValue
Additional paid-in capital 399,629us-gaap_AdditionalPaidInCapital 335,071us-gaap_AdditionalPaidInCapital
Accumulated deficit (168,917)us-gaap_RetainedEarningsAccumulatedDeficit (214,046)us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity 230,993us-gaap_StockholdersEquity 121,286us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 278,070us-gaap_LiabilitiesAndStockholdersEquity $ 173,886us-gaap_LiabilitiesAndStockholdersEquity