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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Current assets    
Cash and cash equivalents $ 38,063 $ 16,507
Investments 77,684 46,365
Accounts receivable 6,404 13,433
Inventory 19,694 23,065
Prepaid expenses and other current assets 2,028 2,249
Total current assets 143,873 101,619
Property and equipment, net 34,490 37,920
Long-term restricted cash 4,500 4,500
Other long-term assets 43 45
Total assets 182,906 144,084
Current liabilities    
Accounts payable 5,966 9,093
Accrued expenses 9,298 12,618
Deferred service revenue, current 5,740 6,319
Other liabilities, current 645 605
Total current liabilities 21,649 28,635
Deferred service revenue, non-current 1,016 1,075
Deferred rent, non-current 13,949 14,453
Notes payable, non-current 14,384 13,635
Financing derivative 28 183
Total liabilities 51,026 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 148,894 and 116,277 shares at September 30, 2018 and December 31, 2017, respectively 149 116
Additional paid-in-capital 1,083,062 965,752
Accumulated other comprehensive loss (24) (32)
Accumulated deficit (951,307) (879,733)
Total stockholders' equity 131,880 86,103
Total liabilities and stockholders' equity $ 182,906 $ 144,084