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Consolidated Statements of Operations Information for Each of Previous Eight Quarters (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information [Line Items]
Revenue	$ 51,942	$ 49,529	$ 47,731	$ 44,830	$ 41,611	$ 36,580	$ 32,455	$ 30,590	$ 194,032	$ 141,236	$ 104,541
Gross profit	28,350	27,346	26,643	25,162	22,475	16,593	18,518	16,600
Operating expenses	44,089	41,643	43,458	38,854	38,349	36,986	26,982	24,914
Net income	$ 5,638	$ 4,794	$ 2,738	$ 3,448	$ 12,178	$ 4,669	$ 8,438	$ 3,068	$ 16,617	$ 28,353	$ 11,681
Earnings per share
Basic	$ 0.13	$ 0.11	$ 0.06	$ 0.08	$ 0.28	$ 0.11	$ 0.25	$ 0.09	$ 0.38	$ 0.74	$ 0.35
Diluted	$ 0.12	$ 0.10	$ 0.06	$ 0.08	$ 0.27	$ 0.11	$ 0.24	$ 0.09	$ 0.37	$ 0.72	$ 0.34

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