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Condensed Consolidated Balance Sheets (Unaudited) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Current assets:    
Cash and cash equivalents $ 212,015 $ 162,171
Marketable securities 403,264 137,500
Collaboration receivable 50,000 0
Prepaid expenses and other current assets 12,714 8,650
Total current assets 677,993 308,321
Property and equipment, net 64,343 38,513
Restricted cash 14,840 14,840
Operating lease right-of-use assets 105,315 86,859
Long-term Investments 29,430 2,577
Other assets 1,157 567
Total assets 893,078 451,677
Current liabilities:    
Accounts payable 8,030 6,314
Accrued expenses and other current liabilities 19,581 18,463
Derivative liabilities 85,400 71,200
Current portion of deferred revenue 10,024 24
Current portion of lease liability 3,491 4,218
Current portion of equipment financing liability 2,189 2,118
Total current liabilities 128,715 102,337
Long-term lease liability 132,793 96,014
Long-term equipment financing liability 4,176 5,294
Contingent consideration liabilities 37,559 0
Long-term portion of deferred revenue 40,381 394
Other liabilities 903 2,077
Total liabilities 344,527 206,116
Commitments and contingencies (See Note 7, Leases, Note 9, License agreements and Note 10, Collaboration and license agreements)
Stockholders’ equity:    
Preferred stock, $0.01 par value; 25,000,000 shares authorized, and no shares issued or outstanding at June 30, 2021 and December 31, 2020, respectively
Common stock, $0.01 par value; 250,000,000 shares authorized, 65,045,313 and 58,446,016 issued, and 64,452,682 and 57,254,178 outstanding at June 30, 2021 and December 31, 2020, respectively 645 573
Additional paid-in capital 1,223,324 642,633
Accumulated other comprehensive income (loss) 31 (9)
Accumulated deficit (675,449) (397,636)
Total stockholders’ equity 548,551 245,561
Total liabilities and stockholders equity $ 893,078 $ 451,677