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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Current assets:    
Cash and cash equivalents $ 12,702 $ 10,501
Short-term investments 60,956 124,452
Receivables, net 31,838 3,841
Inventory 978 1,355
Prepaid expense and other assets 5,927 11,136
Total current assets 112,401 151,285
Property and equipment, net 1,907 2,551
Right of use assets 29,824 25,526
Restricted investments 1,054 1,055
Advanced payments, non-current 205 625
Total assets 145,391 181,042
Current liabilities:    
Accounts payable 9,502 4,199
Accrued expenses 33,321 28,755
Current portion of lease liabilities 4,874 3,782
Total current liabilities 47,697 36,736
Lease liabilities, non-current 31,405 28,770
Unsecured convertible senior notes, net 312,585 236,288
Commitments and contingencies (Note 9)
Shareholders' deficit:    
Preferred stock, par value $0.01 per share, 20,000,000 shares authorized; none issued and outstanding at June 30, 2021 and December 31, 2020.
Common stock, par value $0.01 per share, 150,000,000 shares authorized at June 30, 2021 and December 31, 2020; 62,490,940 and 61,671,231 shares issued and outstanding at June 30, 2021 and December 31, 2020, respectively. 624 616
Additional paid-in capital 694,132 751,304
Accumulated deficit (941,052) (872,672)
Total shareholders' deficit (246,296) (120,752)
Total liabilities and shareholders' deficit $ 145,391 $ 181,042