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Summary of Significant Accounting Policies - Net Income per Share Schedule of Weighted Average Number of Shares (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average common shares outstanding (in shares)	34,553	34,259	34,484	34,219
Less: Weighted average unvested restricted shares subject to repurchase (in shares)	5	5	5	5
Weighted average common shares outstanding; basic (in shares)	34,548	34,254	34,479	34,214
Plus: Weighted average options, restricted stock units and restricted shares used to compute diluted net income per common share (in shares)	1,126	1,360	1,218	1,433
Weighted average common shares outstanding; diluted (in shares)	35,674	35,614	35,697	35,647
PSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Shares excluded from net loss per share computation (in shares)	120	146	120	146

X

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

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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 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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