Net Income (Loss) Per Share Attributable to Common Stockholders - Schedule of Reconciliation of Numerator and Denominator of the Basic and Diluted Net Income (Loss) per Share (Detail) - USD ($) |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2018 |
Sep. 30, 2017 |
Sep. 30, 2018 |
Sep. 30, 2017 |
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| Earnings Per Share [Line Items] | ||||
| Net and comprehensive income (loss) | $ 11,537,478 | $ (4,649,567) | $ (1,878,046) | $ (15,165,577) |
| Adjustment of redeemable convertible preferred stock to redemption value | (943,297) | |||
| Net income (loss) attributable to common stockholders | $ 11,537,478 | $ (4,649,567) | $ (1,878,046) | $ (16,108,874) |
| Denominator for basic EPS - weighted-average common shares | 40,527,722 | 26,926,673 | 31,687,434 | 19,889,984 |
| Denominator for diluted EPS - adjusted weighted-average common shares | 40,961,620 | 26,926,673 | 31,687,434 | 19,889,984 |
| Basic and diluted EPS | $ 0.28 | $ (0.17) | $ (0.06) | $ (0.81) |
| Stock Option [Member] | ||||
| Earnings Per Share [Line Items] | ||||
| Dilutive effect of shares | 426,860 | |||
| Restricted Stock [Member] | ||||
| Earnings Per Share [Line Items] | ||||
| Dilutive effect of shares | 7,038 | |||
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- Definition Earnings per share. No definition available.
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- Definition The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition 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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of decrease to net income for accretion of temporary equity to its redemption value to derive net income apportioned to common stockholders. No definition available.
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- Definition 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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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