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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Cash flows from operating activities:    
Net loss $ (3,320) $ (26,443)
Adjustments to reconcile net loss to cash flows from operating activities:    
Depreciation 2 1
Deferred tax assets (1,059) (7,196)
Amortization of warrant issuance costs 0 26
Stock-based compensation 778 879
Changes in assets and liabilities:    
Accounts receivables 5 2
Prepaid expenses and other assets (369) (261)
Accounts payable 313 (122)
Accrued payroll and related expenses 60 54
Accrued licensing costs (355) (9,438)
Income tax payable (3) 2
Other liabilities (14) (13)
Accrued licensing 0 38,284
Net cash (used in) operating activities (3,962) (4,225)
Cash flows from investing activities:    
Purchase of investments (4,060) (2,476)
Proceeds from sale or maturity of investments 2,412 10,991
Net cash provided by (used in) investing activities (1,648) 8,515
Net change in cash and cash equivalents (5,610) 4,290
Cash and cash equivalents, beginning of period 142,018 192,908
Cash and cash equivalents, end of period 136,408 197,198
Cash paid for income taxes $ 2 $ 0