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Condensed Consolidated Balance Sheets - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Current assets    
Cash and cash equivalents $ 23,058 $ 16,507
Investments 40,433 46,365
Accounts receivable 7,446 13,433
Inventory 23,440 23,065
Prepaid expenses and other current assets 2,035 2,249
Total current assets 96,412 101,619
Property and equipment, net 36,103 37,920
Long-term restricted cash 4,500 4,500
Other long-term assets 43 45
Total assets 137,058 144,084
Current liabilities    
Accounts payable 4,169 9,093
Accrued expenses 10,935 12,618
Deferred service revenue, current 6,416 6,319
Other liabilities, current 744 605
Total current liabilities 22,264 28,635
Deferred service revenue, non-current 1,053 1,075
Deferred rent, non-current 14,106 14,453
Notes payable, non-current 14,121 13,635
Financing derivative 40 183
Total liabilities 51,584 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 131,888 and 116,277 shares at June 30, 2018 and December 31, 2017, respectively 132 116
Additional paid-in-capital 1,011,621 965,752
Accumulated other comprehensive loss (16) (32)
Accumulated deficit (926,263) (879,733)
Total stockholders' equity 85,474 86,103
Total liabilities and stockholders' equity $ 137,058 $ 144,084