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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Operating Activities    
Net income (loss) $ (2,212) $ 37,096
Adjustments to reconcile net income (loss) to net cash used in operating activities:    
Stock-based compensation expense 299 861
Depreciation and amortization 4 180
Change in fair value of long-term receivables (76)  
Change in fair value of derivative liabilities 76  
Bad debt expense   200
Net gain on disposal of assets (4,736) (57,245)
Changes in operating assets and liabilities:    
Accounts and other receivables   1,618
Prepaid and other current assets 865 2,197
Accounts payable (189) (5,382)
Accrued compensation and other accrued liabilities (2,746) (3,680)
Operating lease liability and right-of-use asset 28 41
Deferred revenue   (230)
Net cash flows used in operating activities (8,687) (24,344)
Investing Activities    
Proceeds from maturities of short-term investments   2,504
Proceeds from the sale of property and equipment   447
Proceeds from the sale of complement portfolio to Vertex 5,000 55,000
Proceeds from the sale of legacy rare bleeding disorder program to GCBP 1,000  
Payment of transaction costs in connection with the sale of complement portfolio to Vertex   (2,576)
Payment of transaction costs in connection with the sale of legacy rare bleeding disorder program to GCBP (794)  
Net cash flows provided by investing activities 5,206 55,375
Financing Activities    
Payment of dividends (11,264)  
Issuance of common stock from stock grants and option exercises 2 16
Net cash flows (used in) provided by financing activities (11,262) 16
Net (decrease) increase in cash and cash equivalents (14,743) 31,047
Cash and cash equivalents at beginning of the period 21,666 44,347
Cash and cash equivalents at end of the period 6,923 $ 75,394
Supplemental Disclosure on Non-Cash Investing and Financing Activities:    
CVR derivative liability 4,530  
Exercise of stock options in prepaid and other current assets $ 22