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Stock Based Compensation - Summary of Stock-based Compensation Reflected within Statements of Operations (Detail) - USD ($) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Share-based Compensation, Total | $ 2,069,907 | $ 2,797,933 | $ 4,346,206 | $ 5,969,325
Research and Development Expense [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Allocated share-based compensation expense | 1,032,049 | 1,361,225 | 2,133,027 | 3,017,778
Selling and Marketing Expense [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Allocated share-based compensation expense | 440,335 | 343,945 | 804,793 | 720,993
General and Administrative Expense [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Allocated share-based compensation expense | $ 597,523 | $ 1,092,763 | $ 1,408,386 | $ 2,230,554

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