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Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Cash flows from operating activities:        
Net loss $ (5,052) $ (8,184) $ (14,620) $ (16,140)
Adjustments to reconcile net loss to net cash used in operating activities:        
Depreciation and amortization     123 134
Amortization of operating lease right-of-use asset     1,033 728
Stock-based compensation     835 911
Goodwill impairment 3,577 3,577
Changes in operating assets and liabilities:        
Accounts receivable     (409) 75
Prepaid expenses and other current assets     (1,042) (141)
Other long-term assets     (428)
Accounts payable     478 (50)
Accrued expenses and other current liabilities     1,515 (643)
Operating lease liability     (1,007) (845)
Deferred revenue     (788) (2,937)
Net cash used in operating activities     (14,310) (15,331)
Cash flows from investing activities:        
Purchases of property and equipment     (77) (118)
Net cash used in investing activities     (77) (118)
Cash flows from financing activities:        
Preferred stock issuance costs     (152)
Proceeds from issuance of common stock, net of issuance costs     1,382 37,079
Proceeds from exercise of warrants     204
Net cash provided by financing activities     1,230 37,283
Net (decrease) increase in cash, cash equivalents and restricted cash     (13,157) 21,834
Cash, cash equivalents and restricted cash — beginning of period     55,465 31,861
Cash, cash equivalents and restricted cash — end of period 42,308 53,695 42,308 53,695
Supplemental information:        
Cash and cash equivalents 40,683 53,491 40,683 53,491
Restricted cash 153 153
Long-term restricted cash 1,472 204 1,472 204
Total cash, cash equivalents and restricted cash shown in the statement of cash flows $ 42,308 $ 53,695 42,308 53,695
Supplemental disclosure of non-cash investing and financing activities:        
Conversion of preferred stock to common stock     $ 1,081