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Consolidated Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Current assets    
Cash and cash equivalents $ 18,844 $ 16,507
Investments 83,510 46,365
Accounts receivable 8,595 13,433
Inventory 17,878 23,065
Prepaid expenses and other current assets 2,832 2,249
Total current assets 131,659 101,619
Property and equipment, net 34,073 37,920
Long-term restricted cash 4,500 4,500
Other long-term assets 43 45
Total assets 170,275 144,084
Current liabilities    
Accounts payable 6,736 9,093
Accrued expenses 12,823 12,618
Deferred service revenue, current 6,537 6,319
Other liabilities, current 788 605
Total current liabilities 26,884 28,635
Deferred service revenue, non-current 890 1,075
Deferred rent, non-current 13,765 14,453
Notes payable 14,659 13,635
Financing derivative 16 183
Total liabilities 56,214 57,981
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 150,244 and 116,277 shares at December 31, 2018 and 2017, respectively 150 116
Additional paid-in-capital 1,096,053 965,752
Accumulated other comprehensive loss (36) (32)
Accumulated deficit (982,106) (879,733)
Total stockholders' equity 114,061 86,103
Total liabilities and stockholders' equity $ 170,275 $ 144,084