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STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Cash flows from operating activities:    
Net loss $ (4,256) $ (6,444)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 16 17
Amortization of right-of-use asset - operating 49  
Amortization of premiums and discounts on marketable securities   2
Share-based compensation 124 215
Change in operating assets and liabilities:    
Other current assets 259 522
Accounts payable (95) (405)
Accrued compensation and employee benefits 8 (573)
Accrued expenses and other liabilities 252 (235)
Net cash used in operating activities (3,643) (6,901)
Cash flows from investing activities:    
Purchases of property and equipment (2) (4)
Proceeds from maturities of marketable securities   3,050
Net cash (used in) provided by investing activities (2) 3,046
Cash flows from financing activities:    
Proceeds from the issuance of common stock 7,281 3,532
Common stock offering costs (368) (117)
Repayment of principal on vendor finance agreement (231) (206)
Net cash provided by financing activities 6,682 3,209
Net increase (decrease) in cash and cash equivalents 3,037 (646)
Cash and cash equivalents, beginning of period 6,608 8,702
Cash and cash equivalents, end of period 9,645 8,056
Supplemental cash flow information:    
Interest paid 6 6
Income tax refund received 151 31
Supplemental disclosure of noncash investing and financing transactions:    
Vendor finance agreement 118 105
Common stock offering costs accrued but not yet paid 14  
Leased assets obtained in exchange for operating lease liabilities, upon adoption $ 60  
Change in unrealized loss on marketable securities   $ 2