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Stockholders' Equity (The 2018 ANP Equity Incentive Plan) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Options granted |  |  |  |  | 1,436,929 |  |
Options outstanding | 8,905,358 |  |  |  | 8,905,358 |  | 8,580,475
Number of vested options |  |  |  |  | 1,223,108 |  |
Number of unvested options | 2,883,689 |  |  |  | 2,883,689 |  | 2,825,652
Vested options cancelled |  |  |  |  | 155,784 |  |
Unvested options cancelled |  |  |  |  | 155,784 |  |
Contractual term |  |  |  |  | 5 years 4 months 2 days |  |
Plan modification, share-based compensation expense |  | $ 2,300 |  | $ 2,300 |  |  |
Allocated share based compensation | $ 3,919 |  | $ 4,370 |  | $ 14,837 | $ 16,165 |
General and administrative |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Plan modification, share-based compensation expense |  | $ 1,800 |  | $ 1,800 |  |  |
Allocated share based compensation | $ 2,533 |  | 2,899 |  | $ 10,069 | 11,170 |
The 2018 ANP Equity Incentive Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Allocated share based compensation |  |  | $ 200 |  |  | $ 500 |
The 2018 ANP Equity Incentive Plan | Employees |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Options outstanding | 4,091,080 |  |  |  | 4,091,080 |  |
Number of vested options | 1,944,771 |  |  |  |  |  |
Number of unvested options | 2,146,309 |  |  |  | 2,146,309 |  |
Options fair value | $ 800 |  |  |  |  |  |
Options cancelled | 927,800 |  |  |  |  |  |
Vested options cancelled | 56,925 |  |  |  |  |  |
Unvested options cancelled | 870,875 |  |  |  |  |  |
The 2018 ANP Equity Incentive Plan | Employees | The 2018 ANP Equity Incentive Plan Termination |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Options outstanding |  | 5,018,880 |  | 5,018,880 |  |  |
The 2015 Equity Incentive Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Compensation cost not yet recognized | $ 500 |  |  |  | $ 500 |  |
The 2015 Equity Incentive Plan | Employees |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Contractual term | 10 years |  |  |  |  |  |
The 2015 Equity Incentive Plan | Employees | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period | 1 year |  |  |  |  |  |
The 2015 Equity Incentive Plan | Employees | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period | 2 years |  |  |  |  |  |

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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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