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Consolidated Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Current assets    
Cash and cash equivalents $ 16,507 $ 16,765
Investments 46,365 55,213
Accounts receivable 13,433 11,421
Inventory 23,065 15,634
Prepaid expenses and other current assets 2,249 9,978
Total current assets 101,619 109,011
Property and equipment, net 37,920 14,560
Long-term restricted cash 4,500 4,500
Other long-term assets 45 9,813
Total assets 144,084 137,884
Current liabilities    
Accounts payable 9,093 8,359
Accrued expenses 12,618 16,604
Deferred service revenue, current 6,319 7,130
Other liabilities, current 605 1,681
Total current liabilities 28,635 33,774
Deferred service revenue, non-current 1,075 1,297
Deferred rent, non-current 14,453 19
Other liabilities, non-current   1,664
Notes payable, non-current 13,635 16,106
Financing derivative 183 356
Total liabilities 57,981 53,216
Commitments and contingencies (Note 7)
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 116,277 and 92,677 shares at December 31, 2017 and 2016, respectively 116 93
Additional paid-in-capital 965,752 872,114
Accumulated other comprehensive income (loss) (32) 5
Accumulated deficit (879,733) (787,544)
Total stockholders' equity 86,103 84,668
Total liabilities and stockholders' equity $ 144,084 $ 137,884