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Consolidated Balance Sheets - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Current assets:    
Cash and cash equivalents $ 67,005,000 $ 29,906,000
Restricted cash 158,000 316,000
Short-term investments 0 19,978,000
Accounts receivable, net 4,218,000 3,513,000
Inventory 4,973,000 4,155,000
Prepaid expenses and other current assets 3,122,000 2,889,000
Total current assets 79,476,000 60,757,000
Property and equipment, net 25,867,000 26,778,000
Other assets 3,265,000 6,190,000
Total assets 108,608,000 93,725,000
Current liabilities:    
Accounts payable 5,582,000 4,789,000
Accrued expenses and other current liabilities 19,707,000 15,904,000
Paycheck Protection Program loan — current 4,061,000  
Short-term note payable   5,028,000
Deferred revenue — current 33,275,000 32,503,000
Recognized loss on purchase commitments — current 11,080,000 7,394,000
Total current liabilities 73,705,000 65,618,000
Promissory notes 63,027,000 70,020,000
Accrued interest — promissory notes 4,150,000 2,002,000
Long-term Midcap credit facility 49,335,000 38,851,000
Senior convertible notes 5,000,000 5,000,000
Recognized loss on purchase commitments — long term 84,208,000 84,639,000
Operating lease liability 1,202,000 2,514,000
Deferred revenue — long term 1,662,000 8,344,000
Milestone rights liability 5,926,000 7,263,000
Paycheck Protection Program loan — long term 812,000  
Total liabilities 289,027,000 284,251,000
Commitments and contingencies (Note 13)
Stockholders' deficit:    
Undesignated preferred stock, $0.01 par value — 10,000,000 shares authorized; no shares issued or outstanding at December 31, 2020 and 2019
Common stock, $0.01 par value — 400,000,000 and 280,000,000 shares authorized, 242,117,089 and 211,787,573 shares issued and outstanding at December 31, 2020 and 2019, respectively 2,421,000 2,118,000
Additional paid-in capital 2,866,303,000 2,799,278,000
Accumulated other comprehensive loss   (19,000)
Accumulated deficit (3,049,143,000) (2,991,903,000)
Total stockholders' deficit (180,419,000) (190,526,000)
Total liabilities and stockholders' deficit $ 108,608,000 $ 93,725,000