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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Revenue $ 8,045 $ 10,362 $ 24,567 $ 26,829
Cost of revenue 5,560 5,689 17,302 14,598
Gross profit on revenue 2,485 4,673 7,265 12,231
Operating expenses:        
Research and development 7,689 7,250 18,483 16,614
Selling, general and administrative 10,932 8,724 34,713 27,040
Amortization of intangible assets 50 50 151 151
Total operating expenses 18,671 16,024 53,347 43,805
Loss from operations (16,186) (11,351) (46,082) (31,574)
Non-operating (expense) income, net:        
Gain from revaluation of warrant liability 1,109 1,738 4,698 14,263
Foreign exchange loss (10) (941) (624) (945)
Interest expense (505) (249) (1,061) (333)
Other income, net 7 52 36 106
Total non-operating income, net 601 600 3,049 13,091
Loss before income taxes (15,585) (10,751) (43,033) (18,483)
Provision (benefit) for income taxes 95 8 (1,921) 90
Net loss $ (15,680) $ (10,759) $ (41,112) $ (18,573)
Net loss per share:        
Basic $ (0.16) $ (0.14) $ (0.43) $ (0.25)
Diluted $ (0.17) $ (0.16) $ (0.48) $ (0.44)
Weighted average shares outstanding used in the calculation of net loss per share:        
Basic 96,864 75,194 95,347 73,407
Diluted 97,605 76,103 96,340 75,437