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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Statement [Abstract]      
Revenue, net $ 260,713 $ 189,903 $ 130,449
Cost of goods sold 173,759 129,450 86,203
Gross profit 86,954 60,453 44,246
Operating expenses      
Research and development 31,780 20,852 15,970
Sales and marketing 6,627 6,381 6,043
General and administrative 25,527 19,771 17,095
Total operating expenses 63,934 47,004 39,108
Income from operations 23,020 13,449 5,138
Other income (expense)      
Interest income 247 328 369
Interest expense (1,717) (1,018) (326)
Other expense, net (547) (1,591) (699)
Total other expense (2,017) (2,281) (656)
Income(loss) before income taxes 21,003 11,168 4,482
Income tax (expense) benefit 10,231 (375) (199)
Net income (loss) after taxes $ 31,234 $ 10,793 $ 4,283
Net income (loss) per share basic $ 1.82 $ 0.69 $ 0.30
Net income (loss) per share diluted $ 1.76 $ 0.65 $ 0.28
Weighted average shares used to compute net income per share: basic 17,201,731 15,626,753 14,307,477
Weighted average shares used to compute net income per share: Diluted 17,712,928 16,532,850 15,186,961