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Quarterly Summarized Financial Information (Detail) - USD ($) $ / shares in Units, $ 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]
Total revenue, net	$ 143,277	$ 112,408	$ 100,792	$ 73,278	$ 77,330	$ 55,323	$ 52,643	$ 43,919	$ 429,755	$ 229,214	$ 181,104
Gross margin	112,612	86,964	78,022	56,138	59,821	41,782	39,797	33,271	333,736	174,671	136,152
Net (loss) income	$ 7,068	$ (3,462)	$ (1,820)	$ (24,431)	$ (33,670)	$ (24,471)	$ (34,210)	$ (24,095)	$ (22,645)	$ (116,445)	$ (67,865)
Loss per share:
Basic	$ 0.02	$ (0.01)	$ (0.01)	$ (0.07)	$ (0.11)	$ (0.08)	$ (0.12)	$ (0.08)	$ (0.07)	$ (0.39)	$ (0.25)
Diluted	$ 0.02	$ (0.01)	$ (0.01)	$ (0.07)	$ (0.11)	$ (0.08)	$ (0.12)	$ (0.08)	$ (0.07)	$ (0.39)	$ (0.25)

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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