BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 44,477	$ 49,720
Short-term Investments	995us-gaap_ShortTermInvestments
Prepaid expenses and other current assets	322	428
Total current assets	45,794us-gaap_AssetsCurrent	50,148us-gaap_AssetsCurrent
Property and equipment, net of accumulated depreciation of $358 and $356	42us-gaap_PropertyPlantAndEquipmentNet	44us-gaap_PropertyPlantAndEquipmentNet
Investments	496us-gaap_LongTermInvestments
Other assets	19us-gaap_OtherAssetsNoncurrent	21us-gaap_OtherAssetsNoncurrent
Total assets	46,351us-gaap_Assets	50,213us-gaap_Assets
Current liabilities:
Accounts payable	3,055us-gaap_AccountsPayableCurrent	536us-gaap_AccountsPayableCurrent
Accrued expenses	1,516us-gaap_AccruedLiabilitiesCurrent	1,503us-gaap_AccruedLiabilitiesCurrent
Current portion of long term debt	875us-gaap_LongTermDebtCurrent
Total current liabilities	5,446us-gaap_LiabilitiesCurrent	2,039us-gaap_LiabilitiesCurrent
Notes payable	6,125us-gaap_LongTermNotesPayable	7,000us-gaap_LongTermNotesPayable
Other long term liabilities	50	20
Total liabilities	11,621us-gaap_Liabilities	9,059us-gaap_Liabilities
Stockholders' equity
Preferred stock, $0.001 par value; 25,000,000 shares authorized, 0 shares issued and outstanding
Common stock, $0.001 par value; 100,000,000 shares authorized, 14,228,897 issued and 14,199,666 outstanding at March 31, 2015 and 14,036,985 issued and 14,007,754 outstanding at December 31, 2014	14us-gaap_CommonStockValue	14us-gaap_CommonStockValue
Additional paid-in capital	114,059us-gaap_AdditionalPaidInCapital	113,476us-gaap_AdditionalPaidInCapital
Accumulated deficit	(79,343)	(72,336)
Total stockholders’ equity	34,730us-gaap_StockholdersEquity	41,154us-gaap_StockholdersEquity
Total liabilities and stockholders’ equity	$ 46,351	$ 50,213

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