Earnings (Loss) and Dividends per Share - Computational Components of Basic and Diluted Earnings Per Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]
Basic net income (loss) and earnings (loss) per share, Numerator (Income)	$ 3,703	$ (1,461)	$ 11,217	$ 3,790
Common stock equivalents arising from stock options and employee stock purchase plan, Numerator (Income)
Diluted earnings (loss) and earnings (loss) per share, Numerator (Income)	$ 3,703	$ (1,461)	$ 11,217	$ 3,790
Basic net income (loss) and earnings (loss) per share, Denominator (Shares)	25,691,884	19,965,010	25,647,561	18,275,085
Common stock equivalents arising from stock options and employee stock purchase plan, Denominator (Shares)	437,000		458,000	607,000
Diluted earnings (loss) and earnings (loss) per share, Denominator (Shares)	26,129,427	19,965,010	26,105,415	18,881,927
Basic net income (loss) and earnings (loss) per share, Per Share Amount	$ 0.14	$ (0.07)	$ 0.44	$ 0.21
Common stock equivalents arising from stock options and employee stock purchase plan, Per Share Amount	$ 0	$ 0	$ (0.01)	$ (0.01)
Diluted earnings (loss) and earnings (loss) per share, Per Share Amount	$ 0.14	$ (0.07)	$ 0.43	$ 0.20

Impact of common stock equivalents arising from share based payment arrangements on earnings per share basic.

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Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise of stock options or restrictive stock units (RSUs).

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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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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