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Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Nov. 30, 2016 | Dec. 31, 2014 | May 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Unrecognized stock based compensation expense | $ 4,332 |  | $ 4,332 |  |  |  |
Restricted Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock shares issued (in shares) |  |  | 337,000 |  |  |  |
Grant date fair value per share (in dollars per share) |  |  | $ 2.54 |  |  |  |
2012 Equity Incentive Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock shares authorized for issuance (in shares) |  |  |  |  |  | 880,000 | 440,000
2012 Equity Incentive Plan | Restricted Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock shares issued (in shares) |  |  | 337,000 | 742,000 |  |  |
Stock compensation expense recognized | $ 652 | $ 873 | $ 2,196 | $ 2,133 |  |  |
2012 Equity Incentive Plan | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Expiration period |  |  | 5 years |  |  |  |
Percent of voting power |  |  | 10.00% |  |  |  |
Shares vest over period |  |  | 1 year |  |  |  |
2012 Equity Incentive Plan | Minimum | Restricted Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Grant date fair value per share (in dollars per share) |  |  | $ 2.44 |  |  |  |
2012 Equity Incentive Plan | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Expiration period |  |  | 10 years |  |  |  |
2012 Equity Incentive Plan | Maximum | Restricted Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Grant date fair value per share (in dollars per share) |  |  | $ 19.00 |  |  |  |
Shares vest over period |  |  | 4 years |  |  |  |
2016 Omnibus Incentive Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock shares authorized for issuance (in shares) |  |  |  |  | 3,911,000 |  |
2016 Employee Stock Purchase Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Purchase interval period |  |  | 6 months |  |  |  |
Percentage of purchase price to fair market value |  |  | 85.00% |  |  |  |
Percentage of purchase limit on gross compensation | 20.00% |  | 20.00% |  |  |  |

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