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Stock-Based Compensation - Summary of Option Activity (Detail) - 2006 Plan and 2016 Plan - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Number of Shares |  |  |  |
Beginning balance (in shares) | 4,495,145 | 4,369,042 | 4,719,784 |
Granted (in shares) | 627,500 | 687,500 | 567,500 |
Forfeited (in shares) | (225,000) | (53) | (232,527) |
Expired (in shares) | (557,604) | (15,000) |  |
Exercised (in shares) | (733,223) | (546,344) | (685,715) |
Ending balance (in shares) | 3,606,818 | 4,495,145 | 4,369,042 | 4,719,784
Exercisable at end of period (in shares) | 2,556,394 |  |  |
Vested and expected to vest at end of period (in shares) | 3,482,804 |  |  |
Weighted Average Exercise Price at Grant Date |  |  |  |
Beginning balance (in dollars per share) | $ 12.21 | $ 11.15 | $ 10.03 |
Granted (in dollars per share) | 11.27 | 18.38 | 19.22 |
Forfeited (in dollars per share) | 18.83 | 7.94 | 13.99 |
Expired (in dollars per share) | 14.21 | 14.78 |  |
Exercised (in dollars per share) | 7.68 | 11.47 | 9.12 |
Ending balance (in dollars per share) | 12.24 | $ 12.21 | $ 11.15 | $ 10.03
Exercisable at end of period (in dollars per share) | 11.52 |  |  |
Vested and expected to vest at end of period (in dollars per share) | $ 12.22 |  |  |
Weighted Average Remaining Term (Years) |  |  |  |
Weighted Average Remaining Term | 5 years 9 months 3 days | 5 years 6 months 29 days | 5 years 3 months 10 days | 5 years 7 months 17 days
Exercisable at end of period | 4 years 6 months 10 days |  |  |
Vested and expected to vest at end of period | 5 years 7 months 20 days |  |  |
Aggregate Intrinsic Value |  |  |  |
Beginning balance | $ 22,148 | $ 65,438 | $ 24,421 |
Exercised | 2,868 | 2,482 | 5,945 |
Ending balance | 8,511 | $ 22,148 | $ 65,438 | $ 24,421
Exercisable at end of period | 7,302 |  |  |
Vested and expected to vest at end of period | $ 8,337 |  |  |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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