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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Current assets:    
Cash and cash equivalents $ 247,833 $ 67,005
Restricted cash 158 158
Short-term investments 28,962  
Accounts receivable, net 3,573 4,218
Inventory 5,050 4,973
Prepaid expenses and other current assets 2,766 3,122
Total current assets 288,342 79,476
Property and equipment, net 26,507 25,867
Long-term investments 1,480  
Other assets 3,053 3,265
Total assets 319,382 108,608
Current liabilities:    
Accounts payable 6,706 5,582
Accrued expenses and other current liabilities 27,586 19,707
PPP loan — current 4,670 4,061
Deferred revenue — current 25,880 33,275
Recognized loss on purchase commitments — current 8,274 11,080
Total current liabilities 73,116 73,705
Senior convertible notes 222,855  
MidCap credit facility 49,406 49,335
Mann Group promissory notes 53,453 63,027
Accrued interest — Mann Group promissory notes 4,753 4,150
PPP loan — long term 203 812
2024 convertible notes   5,000
Recognized loss on purchase commitments — long term 80,797 84,208
Operating lease liability 869 1,202
Deferred revenue — long term 1,626 1,662
Milestone rights liability 5,926 5,926
Total liabilities 493,004 289,027
Commitments and contingencies (Note 12)
Stockholders' deficit:    
Undesignated preferred stock, $0.01 par value — 10,000,000 shares authorized; no shares issued or outstanding as of March 31, 2021 and December 31, 2020
Common stock, $0.01 par value - 400,000,000 shares authorized, 249,072,677 and 242,117,089 shares issued and outstanding at March 31, 2021 and December 31, 2020, respectively 2,491 2,421
Additional paid-in capital 2,885,946 2,866,303
Accumulated deficit (3,062,059) (3,049,143)
Total stockholders' deficit (173,622) (180,419)
Total liabilities and stockholders' deficit $ 319,382 $ 108,608