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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net loss $ (7,231) $ (12,322)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation expense 765 1,271
Depreciation and amortization 323 324
Loss on disposal of assets 36
Fair value of warrants issued for services 808 352
Change in fair value of warrant liability, net of issuance costs of $645 (8,761)
Excess warrant fair value 6,453
Forgiveness of indebtedness income (1,265)
Changes in operating assets and liabilities:    
Accounts receivable 130 411
Operating lease liabilities, net (52) (19)
Tenant improvement allowance 516
Prepaid expenses and other current assets 375 (486)
Deposits 79 (16)
Accounts payable (86) 331
Accrued expenses 37 (106)
Employee retention credit liability 1,175
Other liabilities 2 230
Contract liability (415) (2)
Net cash used in operating activities (6,398) (10,745)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Acquisitions of property and equipment (484) (624)
Payment for asset purchase (50)
Net cash used in investing activities (534) (624)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from the private placement of common stock and pre-funded warrants 8,000
Payments for issuance costs (645)
Net cash provided by financing activities 7,355
Net increase (decrease) in cash and cash equivalents 423 (11,369)
Cash and cash equivalents at beginning of year 3,519 24,030
Cash and cash equivalents at end of year 3,942 12,661
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:    
Cash paid for interest 2
SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND FINANCING ACTIVITIES:    
Fair value of pre-funded warrants exercised
Fair value of warrants issued in asset purchase $ 116