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CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 28,562 $ 29,485 [1]
Short-term investments 21,134 28,191 [1]
Accounts receivable 4,478 6,125 [1]
Inventories 13,377 13,063 [1]
Prepaid expenses 1,353 848 [1]
Other current assets 1,416 442 [1]
Total current assets 70,320 78,154 [1]
Non-current assets:    
Property and equipment, net 3,615 2,189 [1]
Goodwill 1,316 1,316 [1]
Intangible assets, net 1,243 1,344 [1]
Restricted cash 307 308 [1]
Other assets 51 70 [1]
Total assets 76,852 83,381 [1]
Current liabilities:    
Accounts payable 3,169 5,674 [1]
Accrued liabilities 10,619 9,813 [1]
Deferred revenue 266 181 [1]
Debt-current 0 3,366 [1]
Warrant liability 7,653 20,390 [1]
Total current liabilities 21,707 39,424 [1]
Non-current liabilities:    
Debt-non-current 9,848 0 [1]
Deferred income taxes 102 89 [1]
Other non-current liabilities 987 1,073 [1]
Total liabilities 32,644 40,586 [1]
Commitments and contingencies       [1]
Stockholders' equity:    
Common stock 74 72 [1]
Additional paid-in capital 555,131 545,905 [1]
Accumulated other comprehensive income 6 7 [1]
Accumulated deficit (511,003) (503,189) [1]
Total stockholders' equity 44,208 42,795 [1]
Total liabilities and stockholders' equity $ 76,852 $ 83,381 [1]
[1] The financial information in this column was derived from audited financial statements included in the Company's 2013 Annual Report on Form 10-K.