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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Revenue $ 8,830 $ 8,601 $ 16,522 $ 16,467
Cost of revenue 7,028 4,752 11,742 8,909
Gross profit on revenue 1,802 3,849 4,780 7,558
Operating expenses:        
Research and development 5,213 4,722 10,794 9,364
Selling, general and administrative 12,063 10,080 23,781 18,316
Amortization of intangible assets 51 51 101 101
Total operating expenses 17,327 14,853 34,676 27,781
Loss from operations (15,525) (11,004) (29,896) (20,223)
Non-operating (expense) income, net:        
(Loss) gain from revaluation of warrant liability (2,707) 3,491 3,589 12,525
Foreign exchange gain (loss) 499 (25) (614) (4)
Interest expense (301) (34) (556) (84)
Other income, net 27 27 29 54
Total non-operating (expense) income, net (2,482) 3,459 2,448 12,491
Loss before income taxes (18,007) (7,545) (27,448) (7,732)
(Benefit) provision for income taxes (2,035) 44 (2,016) 82
Net loss $ (15,972) $ (7,589) $ (25,432) $ (7,814)
Net loss per share:        
Basic $ (0.17) $ (0.10) $ (0.27) $ (0.11)
Diluted $ (0.17) $ (0.16) $ (0.30) $ (0.28)
Weighted average shares outstanding used in the calculation of net loss per share:        
Basic 95,728 72,899 94,576 72,495
Diluted 95,728 74,517 95,682 74,927