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Equity Incentive Plans - Additional Information (Details) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) Metric $ / shares shares | Dec. 31, 2019 Metric $ / shares shares | Dec. 31, 2018 Metric $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Granted, Wtd. Avg. grant date fair value | $ / shares | $ 1.59 | $ 3.64 | $ 5.91
Options granted (in shares) | 480,000 | 400,000 | 500,000
Vesting period (in years) | 3 years |  |
Stock Options |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Unrecognized compensation costs related to awards | $ | $ 2.2 |  |
Expected weighted average period to recognize expense | 2 years 3 months 18 days |  |
Restricted Stock Award |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Unrecognized compensation costs related to awards | $ | $ 22.0 |  |
Expected weighted average period to recognize expense | 2 years 2 months 12 days |  |
Granted (in shares) | 900,000 |  |
Performance measurement | Metric | 2 | 2 | 2
Restricted Stock Award | Minimum |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Award vesting rights (as percent) | 0.00% | 0.00% | 0.00%
Restricted Stock Award | Maximum |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Award vesting rights (as percent) | 200.00% | 200.00% | 200.00%
Restricted Stock Award | Tranche One |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Award vesting rights (as percent) | 50.00% | 50.00% | 50.00%
Performance period | 3 years | 3 years | 3 years
Restricted Stock Award | Tranche Two |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Award vesting rights (as percent) | 50.00% | 50.00% | 50.00%
Performance period | 3 years | 3 years | 3 years
Restricted Stock Award | Certain Employees and Executive Officers |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Granted (in shares) | 900,000 | 788,000 | 906,000
Market and Performance Shares | Certain Employees and Executive Officers |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Granted (in shares) | 360,000 | 250,000 | 352,500
Employee Stock |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Discount on purchase of Common Stock for employee from the current market price | 5.00% |  |
Capital shares reserved for future issuance | 750,000 |  |
Issuance of common stock (ESPP) (in shares) | 49,896 | 30,153 | 24,365
2014 Stock Incentive Plan |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Shares authorized | 4,600,000 |  |

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- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made 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=120381028&loc=d3e5070-113901 + Details
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