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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Cash flows from operating activities:    
Net loss $ (93,612) $ (120,407)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 111 77
Goodwill impairment (see Note 2) 0 32,970
Stock-based compensation 7,102 7,929
Foreign currency loss 523 4,757
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets 3,858 7,493
Accounts payable 817 799
Other liabilities 96 (124)
Accrued expenses and other current liabilities 10,277 1,362
Net cash used in operating activities (70,828) (65,144)
Cash flows from investing activities:    
(Purchases) sales of Investments-other 9,796 (9,629)
Purchases of property and equipment (334) (112)
Net cash provided by (used in) investing activities 9,462 (9,741)
Cash flows from financing activities:    
Proceeds from shares issued in connection with the Company's employee stock purchase plan 129 182
Proceeds from the exercise of stock options 0 5
Proceeds from the exercise of pre-funded warrants 51 0
Net cash provided by financing activities 1,033 95,760
Effect of exchange rate changes on cash and cash equivalents 262 (993)
Net change in cash and cash equivalents (60,071) 19,882
Cash and cash equivalents, beginning of year 106,745 86,863
Cash and cash equivalents, end of year 46,674 106,745
Supplemental disclosure of noncash investing and financing activities:    
Operating lease right-of use asset obtained in exchange for lease obligation 544 974
Public Offering    
Cash flows from financing activities:    
Proceeds from issuance of common stock 853 39,584
October 2022 PIPE Transaction    
Cash flows from financing activities:    
Proceeds from issuance of common stock $ 0 $ 55,989