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Stock-Based Compensation - Additional Information (Detail) $ in Thousands | 9 Months Ended
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Sep. 30, 2019 USD ($) shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Award vesting terms | vesting terms ranging from three to five years and include 1) options that vest in one-fifth increments beginning on the grant date and continuing on each of the first four anniversaries of the grant date and 2) options that cliff-vest on the fifth anniversary of the grant date.
Number of shares available for grant | 2,698,168
Common Class A [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Options granted | 99,000
Minimum [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Award vesting period | 3 years
Maximum [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Award vesting period | 5 years
1996 Equity Incentive Plan [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Shares reserved for issuance to directors and employees | 17,500,000
1996 Equity Incentive Plan [Member] | Minimum [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Range of awards of target number of share | 0.00%
1996 Equity Incentive Plan [Member] | Maximum [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Range of awards of target number of share | 100.00%
Restricted Stock [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Expiration date of options granted under equity incentive plan | 10 years
Restricted Stock [Member] | Non-employee Director [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Compensation expense related to performance based compensation agreements | $ | $ 360
Restricted Stock [Member] | Percentage of awards vesting on grant date [Member] | Non-employee Director [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Percentage of awards vesting on grant date | 50.00%
Restricted Stock [Member] | Percentage of Awards Vesting On Last Day of Each Directors Term [Member] | Non-employee Director [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Award vesting period | 1 year
Percentage of awards vesting on grant date | 50.00%
2009 Employee Stock Purchase Plan [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Additional shares reserved | 85,162
2019 Employee Stock Purchase Plan [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Additional shares reserved | 300,000
Performance Based Compensation [Member] |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |
Compensation expense related to performance based compensation agreements | $ | $ 14,525

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