CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
NET REVENUES	$ 106,832	$ 102,865	$ 216,496	$ 192,053
COST OF REVENUES	53,296	51,293	106,480	95,007
GROSS PROFIT	53,536	51,572	110,016	97,046
OPERATING EXPENSES:
Research and development	19,770	19,269	38,922	37,215
Sales and marketing	13,037	13,209	26,510	26,226
General and administrative	7,804	9,334	16,565	17,724
Total operating expenses	40,611	41,812	81,997	81,165
INCOME FROM OPERATIONS	12,925	9,760	28,019	15,881
OTHER INCOME	1,480	1,310	3,257	2,462
INCOME BEFORE INCOME TAXES	14,405	11,070	31,276	18,343
PROVISION FOR INCOME TAXES	1,213	225	2,198	265
NET INCOME	$ 13,192	$ 10,845	$ 29,078	$ 18,078
EARNINGS PER SHARE:
Basic (in dollars per share)	$ 0.44	$ 0.37	$ 0.98	$ 0.62
Diluted (in dollars per share)	$ 0.44	$ 0.37	$ 0.96	$ 0.61
SHARES USED IN PER SHARE CALCULATION:
Basic (in shares)	29,856	29,297	29,729	29,125
Diluted (in shares)	30,312	29,702	30,232	29,597