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Equity Awards and Instruments (Details) |  |  |  |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 15, 2019 $ / shares shares | Mar. 22, 2019 $ / shares shares | Sep. 06, 2018 $ / shares shares | May 29, 2018 $ / shares shares | Mar. 22, 2018 $ / shares shares | Mar. 31, 2018 $ / shares shares | Sep. 30, 2020 | Dec. 31, 2019 USD ($) plan shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of stockholder-approved plans | plan |  |  |  |  |  |  |  | 2 |  |
Put provision start period, number of months since exercise |  |  |  |  |  |  | 6 months |  |  |
Put provision end Period, number of days after start period |  |  |  |  |  |  | 30 days |  |  |
Call Provision Exercise Period |  |  |  |  |  |  | 7 months |  |  |
Stock Option |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Put provision start period, number of months since exercise |  |  |  |  |  |  |  | 6 months |  |
Put provision end Period, number of days after start period |  |  |  |  |  |  |  | 30 days |  |
Call Provision Exercise Period |  |  |  |  |  |  |  | 7 months |  |
Option granted | 10,000 | 4,816,000 | 10,000 | 5,096,000 | 20,000 |  |  | 4,826,000 | 5,126,000 |
Grant date fair value | $ / shares | $ 1.65 | $ 1.66 | $ 1.96 | $ 1.46 | $ 1.43 |  |  |  |  |
Options outstanding |  |  |  |  |  |  |  | 18,691,667 | 19,514,448 | 18,629,380
Income tax withholdings on shares sold back | $ |  |  |  |  |  |  |  |  | $ 1,577,000 |
Acquisition Options |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Grant date fair value | $ / shares |  |  |  |  |  | $ 3.44 |  |  |  |
Options acquired |  |  |  |  |  | 900,000 |  |  |  |
Term of options (in years) |  |  |  |  |  | 5 years |  |  |  |
Initial exercise price | $ / shares |  |  |  |  |  | $ 6.805 |  |  |  |
Cap and collar adjustment | $ / shares |  |  |  |  |  | $ 0.01 |  |  |  |
Options outstanding |  |  |  |  |  |  |  | 900,000 |  |
Restricted stock expense |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Restricted shares granted |  |  |  |  |  |  |  | 493,840 | 512,616 |
Performance conditions vested |  |  |  |  |  |  |  | 241,709 | 451,784 |
Shares sold |  |  |  |  |  |  |  | 25,677 | 76,375 |
Income tax withholdings on shares sold back | $ |  |  |  |  |  |  |  | $ 192,000 | $ 610 |
Restricted stock expense | Share-based Payment Arrangement, Employee [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Restricted shares granted |  |  |  |  |  |  |  |  | 57,670 |
Service condition (in years) |  |  |  |  |  |  |  |  | 3 years |
Restricted stock expense | Share-based Payment Arrangement, Tranche One |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares sold |  |  |  |  |  |  |  |  | 4,798 |
Income tax withholdings on shares sold back | $ |  |  |  |  |  |  |  |  | $ 27,000 |
Restricted stock expense | Share-based Payment Arrangement, Tranche Two |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares sold |  |  |  |  |  |  |  | 23,343 |  |
Income tax withholdings on shares sold back | $ |  |  |  |  |  |  |  | $ 169,000 |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Restricted shares granted |  |  |  |  |  |  |  | 0 | 0 |
RSU outstanding shares |  |  |  |  |  |  |  | 54,771 | 70,687 |
Restricted Stock Units (RSUs) [Member] | Share-based Payment Arrangement, Employee [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Performance conditions vested |  |  |  |  |  |  |  | 16,746 |  |
Shares sold |  |  |  |  |  |  |  | 5,398 |  |
Income tax withholdings on shares sold back | $ |  |  |  |  |  |  |  | $ 39,000 |  |
2015 Equity Incentive Plan | Class B Common Stock | Stock Option |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares reserved for issuance |  |  |  |  |  |  |  | 50,000,000 |  |

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