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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
 [1]
Current assets:    
Cash and cash equivalents $ 50,795 $ 22,781
Short-term investments 48,968 28,513
Investment in marketable equity securities 7,684  
Accounts receivable 5,646 5,493
Inventories 12,842 14,956
Prepaid expenses 1,535 1,210
Other current assets 953 1,932
Total current assets 128,423 74,885
Non-current assets:    
Property and equipment, net 3,712 3,781
Goodwill 1,316 1,316
Intangible assets, net 991 1,142
Restricted cash 623 508
Other assets 123 144
Total assets 135,188 81,776
Current liabilities:    
Accounts payable 6,813 9,882
Accrued liabilities 8,108 8,444
Accrued taxes 818  
Deferred revenue - current 306 376
Debt - current 1,449  
Warrant liability 2,424 10,485
Total current liabilities 19,918 29,187
Non-current liabilities:    
Debt - non-current 18,407 9,872
Deferred income taxes 127 115
Other non-current liabilities 1,215 1,081
Total liabilities $ 39,667 $ 40,255
Commitments and contingencies
Stockholders' equity:    
Common stock $ 97 $ 80
Additional paid-in capital 673,653 583,416
Accumulated other comprehensive income (loss) 4,827 (31)
Accumulated deficit (583,056) (541,944)
Total stockholders' equity 95,521 41,521
Total liabilities and stockholders' equity $ 135,188 $ 81,776
[1] The financial information in this column was derived from audited consolidated financial statements included in the Company's 2014 Annual Report on Form 10-K.