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Employee Benefit Plans and Stock-Based Compensation - Assumptions (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Weighted-average assumptions [Abstract] |  |  |
Expected term | 0 years | 6 years 1 month 6 days | 5 years 9 months 18 days
Volatility (in hundredths) |  | 49.50% | 46.60%
Expected dividend (in hundredths) | 0.00% | 0.00% | 0.00%
Risk-free interest rate (in hundredths) |  | 1.67% | 3.09%
Retirement Savings Plan [Abstract] |  |  |
Period after which all full time employees are eligible to participate in the savings plan | 90 days |  |
Contributions to the retirement savings plans | $ 188,000 | $ 176,000 | $ 180,000
Maximum |  |  |
Retirement Savings Plan [Abstract] |  |  |
Maximum percentage of employer matching contribution if employees contribute at least 6% of base pay (in hundredths) | 4.00% |  |
Minimum |  |  |
Retirement Savings Plan [Abstract] |  |  |
Minimum percentage of employee contribution to get 4% of employer's contribution (in hundredths) | 6.00% |  |

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- Definition Refers to period after which all full time employees are eligible to participate in the 401(k) savings plan. + References No definition available. + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + 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 (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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