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Revenue recognition (Tables) | 12 Months Ended
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Dec. 31, 2022
Revenue from Contract with Customer [Abstract] |
Summary of Disaggregation of Revenue | The Company's revenues disaggregated by the major sources were as follows:
| Year Ended December 31,
2022 |  | 2021 |  | 2020
USG |  | Non-USG |  | Total |  | USG |  | Non-USG |  | Total |  | USG |  | Non-USG |  | Total
Product sales | $ | 445.4 |  |  | $ | 520.8 |  |  | $ | 966.2 |  |  | $ | 530.0 |  |  | $ | 493.9 |  |  | $ | 1,023.9 |  |  | $ | 626.0 |  |  | $ | 363.8 |  |  | $ | 989.8 |
CDMO: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Services | — |  |  | 108.4 |  |  | 108.4 |  |  | — |  |  | 334.9 |  |  | 334.9 |  |  | — |  |  | 166.7 |  |  | 166.7 |
Leases | — |  |  | 4.9 |  |  | 4.9 |  |  | 237.6 |  |  | 62.1 |  |  | 299.7 |  |  | 253.3 |  |  | 30.5 |  |  | 283.8 |
Total CDMO | — |  |  | 113.3 |  |  | 113.3 |  |  | 237.6 |  |  | 397.0 |  |  | 634.6 |  |  | 253.3 |  |  | 197.2 |  |  | 450.5 |
Contracts and grants | 37.2 |  |  | 4.2 |  |  | 41.4 |  |  | 130.2 |  |  | 4.0 |  |  | 134.2 |  |  | 109.2 |  |  | 5.9 |  |  | 115.1 |
Total revenues | $ | 482.6 |  |  | $ | 638.3 |  |  | $ | 1,120.9 |  |  | $ | 897.8 |  |  | $ | 894.9 |  |  | $ | 1,792.7 |  |  | $ | 988.5 |  |  | $ | 566.9 |  |  | $ | 1,555.4 |
Schedules of Concentration of Risk, by Risk Factor | For the years ended December 31, 2022, 2021 and 2020, the Company's product sales from Anthrax Vaccines, Nasal Naloxone products, TEMBEXA, ACAM2000 and Other products as a percentage of total product sales were as follows:
| Year Ended December 31,
| 2022 |  | 2021 |  | 2020
% of product sales: |  |  |  |  |
Anthrax vaccines | 28 | % |  | 25 | % |  | 38 | %
Nasal naloxone products | 39 | % |  | 43 | % |  | 31 | %
TEMBEXA | 12 | % |  | — | % |  | — | %
ACAM2000 | 7 | % |  | 20 | % |  | 20 | %
Other products | 14 | % |  | 12 | % |  | 11 | %
Summary of Deferred Revenue Contract Liabilities | The following table presents the roll forward of the contract liabilities:
| Contract Liabilities
Balance at December 31, 2020 | $ | 100.1 |
Deferral of revenue | 279.7 |
Revenue recognized | (363.4) |
Balance at December 31, 2021 | $ | 16.4 |
Deferral of revenue | 38.9 |
Revenue recognized | (23.6) |
Balance at December 31, 2022 | $ | 31.7 |
Schedule of Accounts Receivable, Net | Accounts receivable including unbilled accounts receivable contract assets consist of the following:
| December 31,
| 2022 |  | 2021
Accounts receivable: |  |  |
Billed | $ | 102.7 |  |  | $ | 228.1 |
Unbilled | 56.4 |  |  | 49.8 |
Allowance for expected credit losses | (0.7) |  |  | (3.2) |
Accounts receivable, net | $ | 158.4 |  |  | $ | 274.7 |

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