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Consolidated Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Current assets    
Cash and cash equivalents $ 16,765 $ 33,629
Investments 55,213 48,641
Accounts receivable 11,421 5,245
Inventory 15,634 10,955
Prepaid expenses and other current assets 9,978 12,071
Total current assets 109,011 110,541
Property and equipment, net 14,560 8,548
Long-term restricted cash 4,500 4,500
Other long-term assets 9,813 7,518
Total assets 137,884 131,107
Current liabilities    
Accounts payable 8,359 4,749
Accrued expenses 16,604 15,551
Deferred service revenue, current 7,130 6,815
Deferred contractual revenue, current   10,822
Other liabilities, current 1,681 241
Total current liabilities 33,774 38,178
Deferred service revenue, non-current 1,297 1,143
Deferred contractual revenue, non-current   1,312
Other liabilities, non-current 1,683 1,386
Notes payable 16,106 14,948
Financing derivative 356 600
Total liabilities 53,216 57,567
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 92,677 and 79,983 shares at December 31, 2016 and 2015, respectively 93 80
Additional paid-in-capital 872,114 786,636
Accumulated other comprehensive income (loss) 5 (7)
Accumulated deficit (787,544) (713,169)
Total stockholders' equity 84,668 73,540
Total liabilities and stockholders' equity $ 137,884 $ 131,107