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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Operating activities:    
Net loss $ (7,247) $ (7,260)
Adjustments to reconcile net loss to net cash flows from operating activities:    
Depreciation and amortization 84 54
Capital gain from sales of property and equipment (96)
Share-based compensation expense 1,099 1,399
Shares issued to a vendor 74
Non cash and accrued interest (25)
Changes in assets and liabilities:    
Prepaid expenses and other assets (126) (40)
Account payables and other accrued liabilities (140) 463
Net cash flows used in operating activities (6,451) (5,310)
Investing activities:    
Purchase of property and equipment (216) (223)
Sales of property and equipment 259
Purchase of marketable debt securities (2,496)
Net cash flows used in investing activities (2,453) (223)
Financing activities:    
Deferred financing fees (18)
Issuance of common stock and warrants, net of issuance costs 36,770
Net cash flows provided by (used in) financing activities 36,770 (18)
Increase (decrease) in cash, cash equivalents and restricted cash 27,866 (5,551)
Cash, cash equivalents and restricted cash at beginning of period 5,263 10,814
Cash, cash equivalents and restricted cash at ending of period 33,129 5,263
Non-cash activities:    
Right-of-use assets obtained in exchange for new operating lease obligations 966
Supplemental disclosure of cash flow information:    
Cash received from interest 97
Rescission of share purchase agreement   3,375
Conversion of Series A Convertible Preferred Stock into common stock 30
Financing fees included in other receivable 412 412
Temporary equity classified to permanent equity $ 500