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Reconciliation of Basic and Diluted Shares Amounts (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
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Net income	$ 3,604	$ 1,659	$ 8,095	$ 8,053	$ 5,638	$ 4,794	$ 2,738	$ 3,448	$ 21,411	$ 16,617	$ 28,353
Weighted average shares used in computing net income per share - basic									48,343,000	43,767,000	38,234,000
Effect of dilutive shares:
Stock options and restricted stock awards									864,000	581,000	441,000
Convertible senior notes									0	1,123,139	474,923
Dilutive potential common shares									864,000	1,704,000	916,000
Weighted average shares used in computing net income per share - diluted									49,206,000	45,471,000	39,150,000
Earnings per share:
Basic	$ 0.07	$ 0.03	$ 0.17	$ 0.18	$ 0.13	$ 0.11	$ 0.06	$ 0.08	$ 0.44	$ 0.38	$ 0.74
Diluted	$ 0.07	$ 0.03	$ 0.17	$ 0.17	$ 0.12	$ 0.10	$ 0.06	$ 0.08	$ 0.44	$ 0.37	$ 0.72

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