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STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (14,448) $ (16,197)
Changes in operating assets and liabilities    
Depreciation and amortization 187 169
Lease incentive (34) (34)
Stock-based compensation expense 22 62
Non cash interest expense 7 12
Accrual of back end fees related to note payable 7 13
Change in fair value of derivative liability   79
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets 183 (11)
Refundable PDUFA fee (2,335)  
Accounts payable 990 (822)
Accrued expenses 943 199
Net cash used in operating activities (17,947) (16,530)
CASH FLOWS INVESTING ACTIVITIES:    
Purchases of property and equipment (8) (206)
Net cash used in investing activities (8) (206)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of convertible bridge note 5,000  
Proceeds from notes payable, net of original note payoff 7,056 500
Proceeds from issuance of stock, net of issuance costs   11,955
Repayment of term note borrowings (28) (43)
Repayment of lease note payable (62) (62)
Proceeds from the exercise of common stock options 72 1
Net cash provided by financing activities 12,038 12,351
Net increase (decrease) in cash and cash equivalents (5,917) (4,385)
Cash and cash equivalents at beginning of period 7,551 11,936
Cash and cash equivalents at end of period 1,634 7,551
Supplemental disclosure of noncash activities    
Accruals of dividends and accretion to redemption value 3,300 2,926
Performance Adjustment to Series A and common shares   12,239
Repayment of term note with proceeds of note payable 944  
Cash paid for interest $ 181 73
Cash paid for taxes   $ 14