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Stock-Based Compensation - Additional Information (Detail) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) $ / shares shares | Jun. 30, 2018 USD ($)
Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Aggregate number of shares granted to awards, share-based compensation arrangements | shares | 4,344,758 |
Weighted average exercise price of the stock options granted | $ / shares | $ 1.91 |
Vesting period | 4 years |
Fair value of stock granted, share-based compensation arrangements | $ 6,300,000 |
Weighted average grant date fair value of the stock options granted | $ / shares | $ 1.46 |
Restricted Stock Units |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Number of restricted stock units issued | shares | 391,200 |
Fair value of Restricted stock options granted | $ 747,192 |
Weighted average grant date fair value of the stock options granted | $ / shares | $ 1.91 |
Unrecognized compensation expense related to non-option | $ 2,300,000 | $ 2,300,000
Options vest over vesting period |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Unrecognized compensation expense related to options | 9,000,000 | 9,000,000
Performance-based Stock Options |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Unrecognized compensation expense related to options | 2,000,000 | 2,000,000
Compensation cost | $ 400,000 | $ 1,400,000

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- Definition Unrecognized cost of unvested options awarded to employees as compensation. + 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 (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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