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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Current assets    
Cash and cash equivalents $ 38,205 $ 18,844
Investments 44,667 83,510
Accounts receivable 7,279 8,595
Inventory 19,650 17,878
Prepaid expenses and other current assets 2,787 2,832
Total current assets 112,588 131,659
Property and equipment, net 33,613 34,073
Operating lease right-of-use assets, net 34,811  
Long-term restricted cash 4,500 4,500
Other long-term assets 65 43
Total assets 185,577 170,275
Current liabilities    
Accounts payable 8,740 6,736
Accrued expenses 11,158 12,823
Deferred service revenue, current 6,428 6,537
Operating lease liabilities, current 3,521  
Notes payable, current 14,938  
Other liabilities, current 312 788
Total current liabilities 45,097 26,884
Deferred service revenue, non-current 769 890
Operating lease liabilities, non-current 44,861  
Deferred rent, non-current   13,765
Notes payable, non-current   14,659
Financing derivative   16
Total liabilities 90,727 56,214
Commitments and contingencies
Stockholders' equity    
Preferred Stock, $0.001 par value: Authorized 50,000 shares; No shares issued or outstanding
Common Stock, $0.001 par value: Authorized 1,000,000 shares; Issued and outstanding 152,672 and 150,244 shares at March 31, 2019 and December 31, 2018, respectively 153 150
Additional paid-in-capital 1,107,121 1,096,053
Accumulated other comprehensive income (loss) 6 (36)
Accumulated deficit (1,012,430) (982,106)
Total stockholders' equity 94,850 114,061
Total liabilities and stockholders' equity $ 185,577 $ 170,275