CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Revenue	$ 56,386	$ 88,879	$ 209,447	$ 302,474
Cost of goods sold	38,849	49,507	132,211	168,348
Gross profit	17,537	39,372	77,236	134,126
Operating expenses
Research and development	14,180	9,190	38,561	24,695
Sales and marketing	2,370	2,551	7,221	6,612
General and administrative	10,591	9,580	29,945	26,188
Total operating expenses	27,141	21,321	75,727	57,495
Income (loss) from operations	(9,604)	18,051	1,509	76,631
Other income (expense)
Interest income	86	61	223	166
Interest expense	(274)	(248)	(624)	(792)
Other income (expense), net	766	(354)	1,320	(898)
Total other income (expense), net	578	(541)	919	(1,524)
Income (loss) before income taxes	(9,026)	17,510	2,428	75,107
Income tax (expense) benefit	5,294	1,865	3,994	(6,872)
Net income (loss)	$ (3,732)	$ 19,375	$ 6,422	$ 68,235
Net income (loss) per share
Net income (loss) per share basic	$ (0.19)	$ 1.00	$ 0.33	$ 3.59
Net income (loss) per share diluted	$ (0.19)	$ 0.95	$ 0.32	$ 3.39
Weighted average shares used to compute net income (loss) per share:
Weighted average shares used to compute net income (loss) per share: basic	19,707,036	19,294,022	19,597,181	18,993,068
Weighted average shares used to compute net income (loss) per share: Diluted	19,707,036	20,422,609	20,038,657	20,133,644