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Stock-Based Compensation - Stock Options (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Stock-based payment awards |  |  |
Options granted (in shares) | 0 | 0 | 0
Stock Options |  |  |
Options outstanding at beginning of period (in shares) | 154 |  |
Options canceled (in shares) | (90) |  |
Options outstanding at end of period (in shares) | 64 | 154 |
Options exercisable (in shares) | 64 | 154 |
Weighted Average Exercise Price Per Share |  |  |
Options outstanding at beginning of period (in dollars per share) | $ 19.40 |  |
Options canceled (in dollars per share) | 15.32 |  |
Options outstanding at end of period (in dollars per share) | 25.18 | $ 19.40 |
Options exercisable (in dollars per share) | $ 25.18 | $ 19.40 |
Weighted Average Remaining Life |  |  |
Weighted average remaining life of outstanding options at end of period | 2 months 12 days |  |
Weighted average remaining life of exercisable options at end of period | 2 months 12 days |  |
Intrinsic value of options exercised during period (n dollars) |  |  | $ 0.8
Options exercised during period (in shares) | 0 | 0 |
Options |  |  |
Stock-based payment awards |  |  |
Vesting period | 3 years |  |
Options | Maximum |  |  |
Stock-based payment awards |  |  |
Expiration period | 7 years |  |
Options | First anniversary vesting |  |  |
Stock-based payment awards |  |  |
Vesting percentage | 33.33% |  |
Vesting period | 1 year |  |
Options | Second anniversary vesting |  |  |
Stock-based payment awards |  |  |
Vesting percentage | 33.33% |  |
Vesting period | 1 year |  |
Options | Third anniversary vesting |  |  |
Stock-based payment awards |  |  |
Vesting percentage | 33.33% |  |
Vesting period | 1 year |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option 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)(1)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + 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)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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