Stock Based Compensation -Summary of Stock-based Compensation Costs Recognized (Detail) - USD ($) |
3 Months Ended | 9 Months Ended | ||
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Sep. 30, 2019 |
Sep. 30, 2018 |
Sep. 30, 2019 |
Sep. 30, 2018 |
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Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | ||||
Total | $ 2,099,675 | $ 3,852,656 | $ 8,069,000 | $ 12,804,744 |
Restricted Stock Units (RSUs) [Member] | ||||
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | ||||
Allocated share-based compensation expense | 2,037,620 | 3,578,276 | 7,796,371 | 11,714,962 |
Performance Share Units [Member] | ||||
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | ||||
Allocated share-based compensation expense | 0 | 207,206 | 0 | 614,862 |
Employee Stock Purchase Plan [Member] | ||||
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] | ||||
Allocated share-based compensation expense | $ 62,055 | $ 67,174 | $ 272,629 | $ 474,920 |
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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Amount of noncash expense for share-based payment arrangement. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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