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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, 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
Schedule Of Earnings Per Share Basic And Diluted [Line Items]
Net income	$ 5,638	$ 4,794	$ 2,738	$ 3,448	$ 12,178	$ 4,669	$ 8,438	$ 3,068	$ 16,617	$ 28,353	$ 11,681
Weighted average shares used in computing net income per share - basic									43,767	38,234	33,573
Effect of dilutive shares:
Stock options and restricted stock awards									581	441	526
Convertible senior notes									1,123	475
Dilutive potential common shares									1,704	916	526
Weighted average shares used in computing net income per share - diluted									45,471	39,150	34,099
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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