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Quarterly Financial Data (Unaudited) (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 67,653	$ 60,308	$ 62,207	$ 58,000	$ 60,930	$ 59,485	$ 59,060	$ 47,713	$ 248,168	$ 227,188	$ 193,118
Gross profit	60,871	54,041	55,991	52,423	54,335	52,327	52,313	42,220
Income (loss) from operations	10,451	7,742	9,171	(125)	4,243	10,759	9,895	(2,087)	27,239	22,810	21,738
Net income	$ 8,190	$ 5,947	$ 8,714	$ 486	$ 4,216	$ 100,423	$ 11,526	$ (612)	$ 23,337	$ 115,553	$ 25,208
Net income (loss) per share, basic (in dollars per share)	$ 0.15	$ 0.11	$ 0.16	$ 0.01	$ 0.08	$ 1.88	$ 0.22	$ (0.01)	$ 0.43	$ 2.17	$ 0.50
Net income (loss) per share, diluted (in dollars per share)	$ 0.15	$ 0.11	$ 0.16	$ 0.01	$ 0.08	$ 1.84	$ 0.21	$ (0.01)	$ 0.42	$ 2.11	$ 0.48

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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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