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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenue $ 76,051,000 $ 51,326,000 $ 39,275,000
Cost of revenue 31,634,000 22,531,000 20,295,000
Gross profit 29,274,000 21,037,000 16,888,000
Operating expenses:      
Research and development 42,564,000 33,710,000 31,322,000
Selling, general and administrative 56,841,000 52,615,000 48,955,000
Impairment of long-lived assets 0 0 150,000
Total operating expenses 99,405,000 86,325,000 80,427,000
Loss from operations (54,988,000) (57,530,000) (61,447,000)
Non-operating (expense) income, net:      
Foreign exchange (loss) gain (87,000) (10,000) 21,000
Interest expense (4,008,000) (3,022,000) (2,445,000)
Other income, net 1,748,000 3,864,000 1,140,000
Total non-operating (expense) income, net (2,347,000) 832,000 (1,284,000)
Loss before income taxes (57,335,000) (56,698,000) (62,731,000)
Provision for income taxes 229,000 3,887,000 175,000
Net loss $ (57,564,000) $ (60,585,000) $ (62,906,000)
Net loss per share:      
Basic $ (0.44) $ (0.56) $ (0.62)
Diluted $ (0.44) $ (0.56) $ (0.62)
Weighted average shares outstanding used for calculating net loss per share:      
Basic 131,663 108,221 101,826
Diluted 131,663 108,221 101,826
Product      
Revenue $ 60,908,000 $ 43,568,000 $ 37,183,000
Government Contract      
Revenue $ 15,143,000 $ 7,758,000 $ 2,092,000