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Condensed Consolidated Statements of Cash Flows - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Cash Flows From Operating Activities:        
Net loss $ (8,316,000) $ (5,084,000) $ (13,481,000) $ (9,563,000)
Adjustments to reconcile net loss to net cash used in operating activities:        
Stock-based compensation     332,000 272,000
Income tax benefit   (359,000)   (689,000)
Goodwill impairment 4,068,000   4,068,000  
Change in fair value of contingent consideration     (73,000) 568,000
Non-cash lease expense     199,000 181,000
Depreciation     77,000 64,000
Deferred research and development tax credit (221,000)   (444,000)  
Changes in operating assets and liabilities:        
Prepaid expenses and other current assets     1,018,000 53,000
Accounts payable     179,000 (181,000)
Accrued expenses     564,000 335,000
Accrued employee benefits     (538,000) (337,000)
Operating lease liability     (234,000) (205,000)
Net Cash Used In Operating Activities     (8,333,000) (9,502,000)
Cash Flows from Investing Activities        
Purchase of property and equipment     (1,000) (17,000)
Net Cash Used in Investing Activities     (1,000) (17,000)
Cash Flows from Financing Activities        
Payment of loans payable     (67,000) (75,000)
Proceeds from issuance ATM offering, net of issuance costs     1,840,000 2,156,000
Net Cash provided by Financing Activities     1,773,000 2,081,000
Effects of exchange rate changes on cash and cash equivalents     (26,000) (98,000)
Net decrease in cash and cash equivalents and restricted cash     (6,587,000) (7,536,000)
Cash and cash equivalents and restricted at the beginning of this period     23,279,000 41,884,000
Cash and cash equivalents and restricted cash at the end of this period 16,692,000 34,348,000 16,692,000 34,348,000
Reconciliation of cash, cash equivalents, and restricted cash reported in the consolidated balance sheet        
Cash and cash equivalents 16,593,000 34,248,000 16,593,000 34,248,000
Restricted cash included in other long-term assets 99,000 100,000 99,000 100,000
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows $ 16,692,000 $ 34,348,000 16,692,000 34,348,000
Supplemental non-cash investing and financing activities:        
Right of use assets obtained in exchange for lease liabilities     937,000 $ 937,000
Series C Preferred Stock        
Supplemental non-cash investing and financing activities:        
Conversion of Series C Preferred Stock to Common Shares     $ 988,000