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Revenue recognition | 6 Months Ended
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Jun. 30, 2019
Revenue from Contract with Customer [Abstract] |
Revenue recognition | Revenue recognition The Company operates as one operating segment. Therefore, results of its operations are reported on a consolidated basis for purposes of segment reporting, consistent with internal management reporting. The Company's revenues disaggregated by the major sources were as follows:
|  | Three Months Ended June 30, 2019 |  | Three Months Ended June 30, 2018
|  | U.S. Government |  | Non-U.S. Government |  | Total |  | U.S. Government |  | Non-U.S. Government |  | Total
Product sales |  | $ | 94.6 |  |  | $ | 88.9 |  |  | $ | 183.5 |  |  | $ | 169.9 |  |  | $ | 10.2 |  |  | $ | 180.1 |
Contract manufacturing |  | — |  |  | 18.7 |  |  | 18.7 |  |  | — |  |  | 23.6 |  |  | 23.6 |
Contracts and grants |  | 38.3 |  |  | 2.7 |  |  | 41.0 |  |  | 15.3 |  |  | 1.2 |  |  | 16.5 |
Total revenues |  | $ | 132.9 |  |  | $ | 110.3 |  |  | $ | 243.2 |  |  | $ | 185.2 |  |  | $ | 35.0 |  |  | $ | 220.2 |
|  | Six months ended June 30, 2019 |  | Six Months Ended June 30, 2018
|  | U.S. Government |  | Non-U.S. Government |  | Total |  | U.S. Government |  | Non-U.S. Government |  | Total
Product sales |  | $ | 167.9 |  |  | $ | 168.6 |  |  | $ | 336.5 |  |  | $ | 235.9 |  |  | $ | 19.9 |  |  | $ | 255.8 |
Contract manufacturing |  | — |  |  | 34.6 |  |  | 34.6 |  |  | — |  |  | 49.8 |  |  | 49.8 |
Contracts and grants |  | 58.7 |  |  | 4.1 |  |  | 62.8 |  |  | 30.1 |  |  | 2.3 |  |  | 32.4 |
Total revenues |  | $ | 226.6 |  |  | $ | 207.3 |  |  | $ | 433.9 |  |  | $ | 266.0 |  |  | $ | 72.0 |  |  | $ | 338.0 |
Contract liabilities When performance obligations are not transferred to a customer at the end of a reporting period, the amount allocated to those performance obligations is reflected as deferred revenue on the consolidated balance sheets and is deferred until control of these performance obligations is transferred to the customer. The following table presents the rollforward of deferred revenue contract liability balances:
December 31, 2018 |  | $ | 73.1 |
Deferral of revenue |  | 23.8 |
Revenue recognized |  | (7.4 | )
June 30, 2019 |  | $ | 89.5 |
Transaction price allocated to remaining performance obligations As of June 30, 2019, the Company had expected future revenues associated with performance obligations that have not been satisfied of approximately $533.2 million. The Company expects to recognize a majority of these revenues within the next 24 months, with the remainder recognized thereafter. However, the amount and timing of revenue recognition for unsatisfied performance obligations can materially change due to timing of funding appropriations from the USG and the overall success of the Company's development activities associated with its PHT product candidates that are then receiving development funding support from the USG under development contracts. In addition, the amount of future revenues associated with unsatisfied performance obligations excludes the value associated with unexercised option periods in the Company's contracts. Contract assets The Company considers unbilled accounts receivables and deferred costs associated with revenue generating contracts, which are not included in inventory or property, plant and equipment, as contract assets. As of June 30, 2019 and December 31, 2018, the Company had contract assets associated with deferred costs of $26.5 million and $1.2 million, respectively, which is reflected as a component of prepaid expenses and other current assets on the Company's consolidated balance sheets. Accounts receivable Accounts receivable including unbilled accounts receivable contract assets consist of the following:
|  | June 30, 2019 |  | December 31, 2018
Billed, net |  | $ | 179.5 |  |  | $ | 234.0 |
Unbilled |  | 38.6 |  |  | 28.5 |
Total, net |  | $ | 218.1 |  |  | $ | 262.5 |
As of June 30, 2019 and December 31, 2018, allowances for doubtful accounts were de minimis.

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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