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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Current assets:    
Cash and cash equivalents $ 1,964 $ 3,084
Short-term investments 14,124 57,704
Receivables, net 15,780 35,185
Inventory 1,892 1,147
Prepaid expense and other assets 5,167 6,625
Total current assets 38,927 103,745
Property and equipment, net 3,109 3,829
Right of use assets 26,603 27,082
Restricted investments 1,154 1,154
Advanced payments, non-current 896 1,159
Total assets 70,689 136,969
Current liabilities:    
Accounts payable 8,507 5,328
Accrued expenses 25,838 46,627
Current portion of lease liabilities 3,702 3,504
Total current liabilities 38,047 55,459
Lease liabilities, non-current 30,540 32,318
Unsecured convertible senior notes, net 163,372 158,213
Commitments and contingencies (Note 8)
Shareholders' deficit:    
Preferred stock, par value $0.01 per share, 20,000,000 shares authorized; none issued and outstanding at June 30, 2020 and December 31, 2019.
Common stock, par value $0.01 per share, 150,000,000 shares authorized at June 30, 2020 and December 31, 2019; 54,515,858 and 54,200,810 shares issued and outstanding at June 30, 2020 and December 31, 2019, respectively 545 542
Additional paid-in capital 635,121 625,048
Accumulated deficit (796,936) (734,611)
Total shareholders' deficit (161,270) (109,021)
Total liabilities and shareholders' deficit $ 70,689 $ 136,969