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STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash flows from operating activities:    
Net loss $ (3,100) $ (4,851)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 11 11
Amortization of right-of-use asset - operating 32  
Amortization of premiums and discounts on marketable securities   2
Share-based compensation 95 157
Change in operating assets and liabilities:    
Other current assets 161 483
Accounts payable (13) (217)
Accrued compensation and employee benefits (36) (623)
Accrued expenses and other liabilities 94 (287)
Net cash used in operating activities (2,756) (5,325)
Cash flows from investing activities:    
Purchases of property and equipment   (1)
Proceeds from maturities of marketable securities   3,050
Net cash provided by investing activities   3,049
Cash flows from financing activities:    
Proceeds from the issuance of common stock 6,517 3,532
Common stock offering costs (287) (117)
Repayment of principal on vendor finance agreement (116) (206)
Net cash provided by financing activities 6,114 3,209
Net increase in cash and cash equivalents 3,358 933
Cash and cash equivalents, beginning of period 6,608 8,702
Cash and cash equivalents, end of period 9,966 9,635
Supplemental cash flow information:    
Interest paid 3 6
Income tax refund received 109  
Supplemental disclosure of noncash investing and financing transactions:    
Vendor finance agreement 233 105
Common stock offering costs accrued but not yet paid 68  
Leased assets obtained in exchange for operating lease liabilities, upon adoption $ 60  
Purchases of property and equipment in accounts payable   1
Change in unrealized loss on marketable securities   $ 2