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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Cash flows from operating activities:    
Net income (loss) $ 299,945 $ (5,608)
Adjustments to reconcile income (loss) to net cash from operating activities:    
Depreciation 1 2
Stock-based compensation 778 785
Changes in assets and liabilities:    
Accounts receivables 0 (2)
Prepaid expenses and other assets (281) (201)
Deferred tax benefit (8,722) 0
Other liabilities (153) 31
Accounts payable 3,274 229
Accrued licensing costs 90,101 0
Accrued payroll and related expenses (64) (54)
Income tax liability 41,481 (1)
Net cash provided by (used in) operating activities 426,360 (4,819)
Cash flows from investing activities:    
Purchase of investments (200) (2,283)
Proceeds from sale or maturity of investments 1,261 1,054
Net cash provided by (used in) investing activities 1,061 (1,229)
Cash flows from financing activities:    
Proceeds from exercise of options 768 816
Proceeds from sale of common stock 4,488 2,848
Net cash provided by financing activities 5,256 3,664
Net increase (decrease) in cash and cash equivalents 432,677 (2,384)
Cash and cash equivalents, beginning of period 3,135 7,611
Cash and cash equivalents, end of period 435,812 5,227
Cash paid for income taxes $ 0 $ 2