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Selected Quarterly Financial Data (unaudited) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Net revenues	$ 125,504	$ 94,151	$ 93,862	$ 97,409	$ 95,676	$ 74,237	$ 74,222	$ 76,949	$ 410,926	$ 321,084	$ 255,066
Gross profit	99,339	71,987	73,344	74,074	73,606	54,319	56,438	56,725	318,744	241,088	174,891
Operating Income (Loss)	17,086	(5,057)	6,815	(1,027)	7,544	(10,433)	(711)	(2,620)	17,817	(6,220)	(18,967)
Net loss	$ 8,219	$ (11,477)	$ (2,029)	$ (4,318)	$ 5,347	$ (13,709)	$ (3,909)	$ (2,617)	$ (9,605)	$ (14,888)	$ (20,283)
Weighted average shares used to compute net (loss) income per share:
Basic (in shares)	121,151	120,085	118,790	116,730	115,123	114,184	112,738	110,904
Diluted (in shares)	129,150	120,085	118,790	116,730	125,610	114,184	112,738	110,904
Net (loss) income per share:
Basic (in dollars per share)	$ 0.07	$ (0.10)	$ (0.02)	$ (0.04)	$ 0.05	$ (0.12)	$ (0.03)	$ (0.02)
Diluted (in dollars per share)	$ 0.06	$ (0.10)	$ (0.02)	$ (0.04)	$ 0.04	$ (0.12)	$ (0.03)	$ (0.02)

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