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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Revenue $ 8,601 $ 10,150 $ 16,467 $ 19,883
Cost of revenue 4,752 5,747 8,909 10,837
Gross profit 3,849 4,403 7,558 9,046
Operating expenses:        
Research and development 4,722 3,506 9,364 6,206
Selling, general and administrative 10,080 7,954 18,316 14,807
Amortization of intangible assets 51 51 101 101
Total operating expenses 14,853 11,511 27,781 21,114
Loss from operations (11,004) (7,108) (20,223) (12,068)
Non-operating gain (expense), net:        
Gain (Loss) from revaluation of warrant liability 3,491 686 12,525 (4,387)
Foreign exchange loss (25) (157) (4) (211)
Interest expense (141) (107) (334) (238)
Other income, net 134 16 304 33
Total non-operating gain (expense), net 3,459 438 12,491 (4,803)
Loss before income taxes (7,545) (6,670) (7,732) (16,871)
Provision for income taxes 44 54 82 105
Net loss $ (7,589) $ (6,724) $ (7,814) $ (16,976)
Net loss per share:        
Basic $ (0.10) $ (0.10) $ (0.11) $ (0.26)
Diluted $ (0.16) $ (0.10) $ (0.28) $ (0.26)
Weighted average shares outstanding used for calculating net loss per share:        
Basic 72,899 69,727 72,495 64,756
Diluted 74,517 71,928 74,927 64,756