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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Current assets:    
Cash and cash equivalents $ 8,861 $ 5,861
Short-term investments 18,481 54,637
Receivables, net 29,931 22,818
Inventory 1,173 88
Prepaid expense and other assets 5,353 6,463
Total current assets 63,799 89,867
Property and equipment, net 3,787 3,845
Right of use assets 21,302  
Restricted investments 1,154 1,154
Advanced payments, non-current 1,221 1,070
Total assets 91,263 95,936
Liabilities and shareholders' deficit    
Accounts payable 9,702 6,281
Accrued expenses 33,996 30,186
Current portion of lease liabilities 3,055  
Current portion of lease liabilities   889
Total current liabilities 46,753 37,356
Lease liabilities, non-current 28,654  
Lease liabilities, non-current   1,578
Unsecured convertible senior notes, net 155,771 148,981
Deferred rent   8,177
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 September 30, 2019 and December 31, 2018.
Common stock, par value $0.01 per share, 150,000,000 shares authorized at September 30, 2019 and December 31, 2018; 49,525,474 and 49,011,684 shares issued and outstanding at September 30, 2019 and December 31, 2018, respectively. 495 490
Additional paid-in capital 564,976 549,479
Accumulated deficit (705,386) (650,125)
Total shareholders' deficit (139,915) (100,156)
Total liabilities and shareholders' deficit $ 91,263 $ 95,936