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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Current assets:    
Cash and cash equivalents $ 160,915 $ 173,984
Marketable securities 21,114  
Accounts receivable   7
Contract assets 2,177 2,324
Prepaid expenses and other current assets 2,001 2,242
Total current assets 186,207 178,557
Property and equipment, net 13,784 14,213
Marketable securities - noncurrent 13,264  
Other long-term assets 2,442 1,966
Restricted cash 3,086 3,086
Right-of-use asset – operating lease 14,484 14,831
Right-of-use assets – financing leases 467 597
Total assets 233,734 213,250
Current liabilities:    
Accounts payable 3,671 3,603
Accrued expenses 9,963 11,084
Deferred revenue, current portion 12,123 12,209
Financing lease obligations, current portion 278 265
Operating lease obligation, current portion 1,588 1,463
Total current liabilities 27,623 28,624
Deferred revenue, net of current portion 4,851 9,877
Financing lease obligations, net of current portion 214 356
Operating lease obligation, net of current portion 23,747 24,578
Warrant liability 7,430 19,711
Debt, net of debt discount, long term 39,892 39,551
Commitments and contingencies (See Note 9)
Stockholders' equity:    
Preferred stock, $0.001 par value; 10,000,000 shares authorized at June 30, 2021 and December 31, 2020; 0 shares issued and outstanding at June 30, 2021 and December 31, 2020
Common stock, $0.001 par value; 200,000,000 shares authorized at June 30, 2021 and December 31, 2020; 61,920,250 and 56,222,746 shares issued and outstanding at June 30, 2021 and December 31, 2020, respectively 61 56
Additional paid-in capital 543,674 467,518
Accumulated other comprehensive loss (19)  
Accumulated deficit (413,739) (377,021)
Total stockholders' equity 129,977 90,553
Total liabilities and stockholders' equity $ 233,734 $ 213,250

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