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Condensed Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities:    
Net loss $ (12,994) $ (7,537)
Adjustments to reconcile net loss to net cash used in operating activities:    
Non-cash lease expense 32  
Depreciation and amortization 172 114
Stock-based compensation expense 1,771 710
Loss on sale and disposal of property and equipment 1 2
Forgiveness of PPP loan (1,006)  
Changes in operating assets and liabilities:    
Accounts receivable (208) 105
Prepaid expenses and other assets 350 (99)
Inventories (71) (41)
Accounts payable, accrued liabilities and other liabilities 208 (165)
Net cash used in operating activities (11,745) (6,911)
Cash flows from investing activities:    
Purchase of property and equipment (136) (123)
Net cash used in investing activities (136) (123)
Cash flows from financing activities:    
Principal repayment of DECD loan (99) (96)
Proceeds from issuance of common stock from exercise of stock options 621 296
Proceeds from PPP loan   1,006
Proceeds from exercise of warrants   5,060
Proceeds from public offering 48,236  
Payment of offering costs for public offering (515)  
Net cash provided by financing activities 48,243 6,266
Net increase (decrease) in cash and cash equivalents 36,362 (768)
Cash and cash equivalents, beginning of period 16,631 11,703
Cash and cash equivalents, end of period 52,993 10,935
Supplemental disclosure of cash flow information:    
Cash paid during the period for interest 38 18
Supplemental disclosure of noncash investing and financing activities:    
Net (decrease) increase in right-of-use assets $ (30) $ 11