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Stock-Based Compensation - Narrative (Detail) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Nov. 30, 2016 | Dec. 31, 2015 | May 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of options vested (in shares) | 261,000 |  | 177,000 | 90,000 |  |  |
Fair value of options vested |  | $ 844 | $ 1,047 | $ 731 |  |  |
Unrecognized stock based compensation expense | $ 7,598 | $ 7,598 |  |  |  |  |
Restricted Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted stock shares issued (in shares) |  | 1,884,000 | 746,000 |  |  |  |
Grant date fair value per share (in dollars per share) |  | $ 2.58 | $ 6.61 |  |  |  |
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) |  | 1,884,000 | 746,000 | 352,000 |  |  |
Stock compensation expense recognized |  | $ 2,909 | $ 2,938 | $ 1,973 |  |  |
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 |  | 5 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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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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