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CONDENSED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (3,694) $ (3,773)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 46 48
Lease incentive (8) (8)
Stock based compensation 113 5
Non cash interest expense   1
Accrual of back end fees related to note payable   (16)
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets (1,317) 20
Refundable PDUFA fee 2,335  
Accounts payable (28) (56)
Accrued expenses 872 8
Net cash used in operating activities (1,681) (3,771)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of stock, net of issuance costs of $193 44,807  
(Repayment of) borrowing from term note (202) 1,044
Repayment of lease note payable (13) (14)
Restricted cash (16)  
Proceeds from the exercise of common stock options 460 1
Net cash provided by financing activities 45,036 1,031
Net increase (decrease) in cash and cash equivalents 43,355 (2,740)
Cash and cash equivalents at beginning of period 1,634 7,551
Cash and cash equivalents at end of period 44,989 4,811
Supplemental disclosure of noncash activities    
Accruals of dividends and accretion to redemption value of preferred stock 1,226 814
Repayment of term note with proceeds of note payable   944
Conversion of bridge note to preferred stock 5,000  
Cash paid for interest 101 $ 20
Cash paid for taxes $ 1