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CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 23,992 $ 29,485 [1]
Short-term investments 24,263 28,191 [1]
Accounts receivable 4,943 6,125 [1]
Inventories 11,307 13,063 [1]
Prepaid expenses 1,661 848 [1]
Other current assets 913 442 [1]
Total current assets 67,079 78,154 [1]
Non-current assets:    
Property and equipment, net 3,166 2,189 [1]
Goodwill 1,316 1,316 [1]
Intangible assets, net 1,294 1,344 [1]
Restricted cash 308 308 [1]
Other assets 64 70 [1]
Total assets 73,227 83,381 [1]
Current liabilities:    
Accounts payable 3,493 5,674 [1]
Accrued liabilities 8,838 9,813 [1]
Deferred revenue 279 181 [1]
Debt - current 3,268 3,366 [1]
Warrant liability 11,356 20,390 [1]
Total current liabilities 27,234 39,424 [1]
Non-current liabilities:    
Deferred income taxes 95 89 [1]
Other non-current liabilities 1,031 1,073 [1]
Total liabilities 28,360 40,586 [1]
Commitments and contingencies       [1]
Stockholders' equity:    
Common stock 72 72 [1]
Additional paid-in capital 548,202 545,905 [1]
Accumulated other comprehensive income 7 7 [1]
Accumulated deficit (503,414) (503,189) [1]
Total stockholders' equity 44,867 42,795 [1]
Total liabilities and stockholders' equity $ 73,227 $ 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.