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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	$ 157,591us-gaap_CashAndCashEquivalentsAtCarryingValue	$ 116,481us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable	2,935us-gaap_AccountsReceivableNetCurrent	2,004us-gaap_AccountsReceivableNetCurrent
Prepaid expenses	4,211us-gaap_PrepaidExpenseCurrent	972us-gaap_PrepaidExpenseCurrent
Total current assets	164,737us-gaap_AssetsCurrent	119,457us-gaap_AssetsCurrent
Restricted cash	300us-gaap_RestrictedCashAndCashEquivalents	405us-gaap_RestrictedCashAndCashEquivalents
Property and equipment, net	6,785us-gaap_PropertyPlantAndEquipmentNet	5,035us-gaap_PropertyPlantAndEquipmentNet
Other assets	2,064us-gaap_OtherAssetsNoncurrent	885us-gaap_OtherAssetsNoncurrent
Total assets	173,886us-gaap_Assets	125,782us-gaap_Assets
Current liabilities:
Accounts payable	1,669us-gaap_AccountsPayableCurrent	3,169us-gaap_AccountsPayableCurrent
Accrued expenses	7,930us-gaap_AccruedLiabilitiesCurrent	3,584us-gaap_AccruedLiabilitiesCurrent
Lease exit liability	1,642us-gaap_RestructuringReserveCurrent	1,439us-gaap_RestructuringReserveCurrent
Deferred revenue	14,248us-gaap_DeferredRevenueCurrent	20,267us-gaap_DeferredRevenueCurrent
Other liabilities	1,605us-gaap_OtherLiabilitiesCurrent	363us-gaap_OtherLiabilitiesCurrent
Total current liabilities	27,094us-gaap_LiabilitiesCurrent	28,822us-gaap_LiabilitiesCurrent
Lease exit liability, net of current portion	6,364us-gaap_RestructuringReserveNoncurrent	8,006us-gaap_RestructuringReserveNoncurrent
Deferred rent liability	2,670us-gaap_DeferredRentCreditNoncurrent	2,904us-gaap_DeferredRentCreditNoncurrent
Deferred revenue, net of current portion	16,472us-gaap_DeferredRevenueNoncurrent	7,136us-gaap_DeferredRevenueNoncurrent
Total liabilities	52,600us-gaap_Liabilities	46,868us-gaap_Liabilities
Stockholders' equity:
Common stock, $0.01 par value-125,000,000 shares authorized, 27,995,638 and 25,177,597 shares outstanding at December 31, 2014 and 2013, respectively	280us-gaap_CommonStockValue	252us-gaap_CommonStockValue
Treasury stock, at cost; 865 and 14,381 shares at December 31, 2014 and 2013, respectively	(19)us-gaap_TreasuryStockValue	(58)us-gaap_TreasuryStockValue
Additional paid-in capital	335,071us-gaap_AdditionalPaidInCapital	254,453us-gaap_AdditionalPaidInCapital
Accumulated deficit	(214,046)us-gaap_RetainedEarningsAccumulatedDeficit	(175,733)us-gaap_RetainedEarningsAccumulatedDeficit
Total stockholders' equity	121,286us-gaap_StockholdersEquity	78,914us-gaap_StockholdersEquity
Total liabilities and stockholders' equity	$ 173,886us-gaap_LiabilitiesAndStockholdersEquity	$ 125,782us-gaap_LiabilitiesAndStockholdersEquity

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The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef



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-Name Regulation S-X (SX)



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-Paragraph 1



-Subparagraph (SX 210.5-02.1)



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- Definition

Carrying amount as of the balance sheet date of known and estimated obligations associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid in the next twelve months or in the normal operating cycle if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

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-Name Staff Accounting Bulletin (SAB)



-Number Topic 5



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-Section 50



-Paragraph 1



-Subparagraph (b)



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- Definition

Carrying amount as of the balance sheet date of known and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid after one year or beyond the next operating cycle, if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

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-Name Accounting Standards Codification



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- Definition

The cumulative amount of the reporting entity's undistributed earnings or deficit.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher SEC



-Name Regulation S-X (SX)



-Number 210



-Section 02



-Paragraph 31



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-Subparagraph (SX 210.5-02.31(a)(3))



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- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



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-Section S99



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-Name Regulation S-X (SX)



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-Paragraph 29, 30, 31



-Article 5

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- Definition

The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 505



-SubTopic 30



-Section 50



-Paragraph 4



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