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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Operating Activities    
Net income (loss) $ 32,212 $ (67,604)
Adjustments to reconcile net income (loss) to net cash used in operating activities:    
Stock-based compensation expense 1,085 2,722
Depreciation and amortization 220 175
Bad debt expense 200  
Loss on lease termination 110  
Net gain on disposal of assets (57,245)  
Changes in operating assets and liabilities:    
Accounts and other receivables 1,618 2,199
Prepaid and other current assets 993 (2,028)
Accounts payable (6,378) (2,063)
Accrued compensation and other accrued liabilities (4,317) 1,473
Operating lease liability and right-of-use asset 111 177
Deferred revenue (230) (1,130)
Net cash flows used in operating activities (31,621) (66,079)
Investing Activities    
Proceeds from maturities of short-term investments 2,504 46,162
Proceeds from the sale of property and equipment 447  
Proceeds from the sale of complement portfolio to Vertex 55,000  
Payment of transaction costs in connection with sale of complement portfolio to Vertex (2,576)  
Purchases of property and equipment   (839)
Net cash flows provided by investing activities 55,375 45,323
Financing Activities    
Issuance of common stock for public offering, net of issuance costs   49,250
Payment of dividends (45,031)  
Issuance of common stock from stock grants and option exercises 20 303
Net cash flow (used in) provided by financing activities (45,011) 49,553
Net (decrease) increase in cash and cash equivalents (21,257) 28,797
Cash and cash equivalents at beginning of the period 44,347 30,360
Cash and cash equivalents at end of the period $ 23,090 59,157
Supplemental Disclosure of Non-Cash Investing and Financing Activities:    
Right-of-use assets obtained in exchange for operating lease liabilities   $ 1,850