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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Current assets:    
Cash and cash equivalents $ 67,243 $ 124,184
Short-term investments 95,203 79,932
Accounts receivable, net 9,823 4,739
Inventory 8,044 7,152
Prepaid expenses and other current assets 3,952 3,482
Total current assets 184,265 219,489
Property and equipment, net 41,453 36,612
Long-term investments 70,542 56,619
Other assets 12,058 8,441
Total assets 308,318 321,161
Current liabilities:    
Accounts payable 8,702 6,956
Accrued expenses and other current liabilities 27,131 27,419
Financing liability — current 9,410 6,977
Deferred revenue — current 1,307 827
Recognized loss on purchase commitments — current 6,944 6,170
Total current liabilities 53,494 48,349
Senior convertible notes 224,307 223,944
Midcap credit facility 38,939 38,833
Promissory notes 18,425 18,425
Accrued interest — promissory notes 520 404
Financing liability — long term 93,463 93,525
Recognized loss on purchase commitments — long term 72,400 76,659
Operating lease liability 826 1,040
Deferred revenue — long term 26,116 19,543
Milestone rights liability 4,838 4,838
Deposits from customer 7,054 4,950
Total liabilities 540,382 530,510
Commitments and contingencies (Note 13)
Stockholders' deficit:    
Undesignated preferred stock, $0.01 par value — 10,000,000 shares authorized; no shares issued or outstanding as of March 31, 2022 and December 31, 2021
Common stock, $0.01 par value - 400,000,000 shares authorized, 252,413,434 and 251,477,562 shares issued and outstanding at March 31, 2022 and December 31, 2021, respectively 2,524 2,515
Additional paid-in capital 2,922,555 2,918,205
Accumulated other comprehensive loss (1,076)  
Accumulated deficit (3,156,067) (3,130,069)
Total stockholders' deficit (232,064) (209,349)
Total liabilities and stockholders' deficit $ 308,318 $ 321,161