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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Current assets:    
Cash and cash equivalents $ 45,204 $ 100,444
Marketable securities 35,798 177,188
Interest receivable 403 794
Accounts receivable 923 3,678
Prepaid expenses and other current assets 12,000 18,223
Total current assets 94,328 300,327
Marketable securities, non-current 0 29,845
Property and equipment, net 26,874 63,531
Intangible assets 0 50,729
Goodwill 0 37,552
Operating lease right-of-use assets 25,991 62,002
Other non-current assets 16,627 17,023
Restricted cash 1,500 1,500
Total assets 165,320 562,509
Current liabilities:    
Accounts payable 15,259 22,418
Accrued compensation and employee benefits 8,918 21,506
Other accrued liabilities 23,554 16,007
Deferred revenues 0 51,780
Total current liabilities 47,731 111,711
Deferred revenues, non-current 0 109,377
Long-term portion of lease liabilities 33,515 38,986
Deferred income tax 0 6,270
Other non-current liabilities 1,187 1,207
Total liabilities 82,433 267,551
Commitments and contingencies
Stockholders’ equity:    
Preferred stock, $0.01 par value, 5,000,000 shares authorized, and no shares issued or outstanding 0 0
Common stock, $0.01 par value; 640,000,000 shares authorized; 178,133,548 and 166,793,320 shares issued and outstanding at December 31, 2023 and 2022, respectively 1,781 1,668
Additional paid-in capital 1,492,077 1,450,239
Accumulated deficit (1,406,376) (1,148,545)
Accumulated other comprehensive loss (4,595) (8,404)
Total stockholders’ equity 82,887 294,958
Total liabilities and stockholders’ equity $ 165,320 $ 562,509