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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) $ (15,846) $ (7,757)
Adjustments to reconcile net loss to cash flows from operating activities:    
Depreciation 3 3
Deferred tax assets 0 (685)
Bad debt 11 0
Stock-based compensation 1,364 1,590
Changes in assets and liabilities:    
Accounts receivables (1) (2)
Prepaid expenses and other assets (79) (134)
Accounts payable 24 12
Accrued payroll and related expenses 81 63
Accrued licensing costs 0 (355)
Other liabilities (23) (31)
Net cash used in operating activities (14,466) (7,296)
Cash flows from investing activities:    
Purchase of investments (25,753) (13,203)
Proceeds from sale or maturity of investments 51,062 5,688
Net cash provided by (used in) investing activities 25,309 (7,515)
Cash flows from financing activities:    
Payment of dividends (71,429) 0
Payment of payroll taxes on vested restricted stock units (5) (29)
Net cash used in financing activities (71,434) (29)
Net change in cash and cash equivalents (60,591) (14,840)
Cash and cash equivalents, beginning of period 86,561 142,018
Cash and cash equivalents, end of period 25,970 127,178
Cash paid for income taxes $ 0 $ 2