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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
CONSOLIDATED STATEMENTS OF OPERATIONS      
Net sales $ 181,278 $ 159,254 $ 114,397
Cost of sales 25,075 21,050 16,177
Gross profit 156,203 138,204 98,220
Operating expenses:      
Selling, general and administrative 119,529 96,260 64,756
In-process research and development   5,320  
Research and development 49,676 38,905 29,223
Total operating expenses 169,205 140,485 93,979
(Loss) income from operations (13,002) (2,281) 4,241
Non-operating income:      
Interest income 2,252 1,375 889
Non-operating income (1,618) 907 (565)
Total non-operating income 634 2,282 324
(Loss) income before taxes (12,368) 1 4,565
Provision for income taxes 583 93 43
Net (loss) income $ (12,951) $ (92) $ 4,522
Basic net (loss) income per share $ (0.37) $ 0.00 $ 0.14
Diluted net (loss) income per share $ (0.37) $ 0.00 $ 0.12
Weighted average shares used to compute basic net (loss) income per share 35,317 34,381 32,928
Weighted average shares used to compute diluted net (loss) income per share 35,317 34,381 36,459