CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current Assets:
Cash and cash equivalents	$ 146,470	$ 18,130
Available-for-sale securities	49,897	50,027
Prepaid expenses and other current assets	3,836	3,718
Total Current Assets	200,203us-gaap_AssetsCurrent	71,875us-gaap_AssetsCurrent
Property and equipment, net	642us-gaap_PropertyPlantAndEquipmentNet	589us-gaap_PropertyPlantAndEquipmentNet
Security deposits	163us-gaap_SecurityDeposit	94us-gaap_SecurityDeposit
Deferred financing costs, net	12,336
Total Assets	213,344us-gaap_Assets	72,558us-gaap_Assets
Current Liabilities:
Accounts payable	13,869us-gaap_AccountsPayableCurrent	13,542us-gaap_AccountsPayableCurrent
Accrued expenses	1,962us-gaap_AccruedLiabilitiesCurrent	2,134us-gaap_AccruedLiabilitiesCurrent
Interest payable on Senior Convertible Debentures	2,500us-gaap_InterestPayableCurrent
Total Current Liabilities	18,331us-gaap_LiabilitiesCurrent	15,676us-gaap_LiabilitiesCurrent
Senior Convertible Debentures	200,000us-gaap_ConvertibleDebtNoncurrent
Derivative financial instruments, at estimated fair value-warrants	172us-gaap_DerivativeLiabilitiesNoncurrent	1,534us-gaap_DerivativeLiabilitiesNoncurrent
Total Liabilities	218,503us-gaap_Liabilities	17,210us-gaap_Liabilities
Commitments and contingencies (Note 7)
Stockholders' Equity/(Deficit):
Preferred stock, Authorized 20,000,000 shares and none outstanding at December 31, 2014 and December 31, 2013.
Common stock, par value of $.0001 authorized 200,000,000 shares at December 31, 2014 and 2013. Issued and outstanding 96,609,764 and 90,182,115 shares at December 31, 2014 and 2013, respectively	11us-gaap_CommonStockValue	10us-gaap_CommonStockValue
Additional paid-in capital	261,715	226,515
Accumulated deficit	(266,885)	(171,177)
Total Stockholders' Equity/(Deficit)	(5,159)us-gaap_StockholdersEquity	55,348us-gaap_StockholdersEquity
Total Liabilities and Stockholders' Equity/(Deficit)	$ 213,344	$ 72,558

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19

-Subparagraph a

-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(a))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682