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Revenue recognition
 6 Months Ended
Jun. 30, 2021
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, 2021Three Months Ended June 30, 2020
 
U.S.
Government
Non-U.S.
Government
 Total
U.S.
Government
Non-U.S.
Government
 Total
Product sales, net$66.3 $114.9 $181.2 $224.2 $74.3 $298.5 
CDMO services70.4 120.5 190.9 44.6 28.0 72.6 
Contracts and grants24.4 1.0 25.4 20.7 2.9 23.6 
Total revenues$161.1 $236.4 $397.5 $289.5 $105.2 $394.7 
Six Months Ended June 30, 2021Six Months Ended June 30, 2020
U.S.
Government
Non-U.S.
Government
 Total
U.S.
Government
Non-U.S.
Government
 Total
Product sales, net$122.7 $196.4 $319.1 $288.1 $158.6 $446.7 
CDMO services167.9 206.8 374.7 44.6 49.7 94.3 
Contracts and grants44.4 2.3 46.7 42.7 3.5 46.2 
Total revenues$335.0 $405.5 $740.5 $375.4 $211.8 $587.2 
Contract liabilities
When performance obligations are not transferred to a customer at the end of a reporting period, cash received associated with amounts allocated to those performance obligations is reflected as contract liabilities on the consolidated balance sheets and is deferred until control of these performance obligations is transferred to the customer. The following table presents the roll forward of the contract liability balances:
December 31, 2020$100.1 
Deferral of revenue194.7 
Revenue recognized(191.4)
June 30, 2021$103.4 
As of June 30, 2021 and December 31, 2020, the current portion of contract liabilities was $54.5 million and $44.6 million, respectively, and was included in other current liabilities on the balance sheet.
Transaction price allocated to remaining performance obligations
The Company has certain performance obligations that are considered an operating lease as the customer obtains substantially all of the economic benefits of the identified asset and has the right to direct its use. The associated revenue is recognized on a straight-line basis over the term of the lease. The remaining term on the Company's operating lease performance obligations approximates 2.0 years. The Company utilizes a cost-plus model to determine the stand-alone selling price of the lease component to allocate contract consideration between the lease and non-lease components. During the three and six months ended June 30, 2021, the Company's lease revenues were $16.9 million and $35.6 million, respectively, which is included within contract development and manufacturing services in the condensed consolidated statement of operations. During the three and six months ended June 30, 2020 the Company's lease revenues were de minimis. The Company has allocated contracted operating lease revenues due under our long-term CDMO service arrangements as follows:
Year ended December 31,
2021 (1)
$33.8 
202267.7 
202328.2 
$129.7 
(1) As of June 30, 2021, amount represents the six months ending December 31, 2021.

As of June 30, 2021, the Company expects future revenues on unsatisfied performance obligations of approximately $1.4 billion associated with all arrangements entered into by the Company. The Company expects to recognize a majority of these revenues within the next 24 months. However, the amount and timing of revenue recognition for unsatisfied performance obligations can materially change due to timing of manufacturing activities, funding appropriations from the USG and the overall success of the Company's development activities associated with its PHT procured 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, 2021 and December 31, 2020, the Company had contract assets associated with deferred costs of $39.7 million and $41.1 million, respectively, which is reflected as a component of other assets on the Company's consolidated balance sheets. During the three and six months ended June 30, 2021, the Company recorded amortization expense of contract assets of $1.6 million, which has been included as a component of research and development expense. The Company did not record amortization expense associated with its contract assets during 2020.
Accounts receivable
Accounts receivable, including unbilled accounts receivable contract assets, consist of the following:
June 30, 2021December 31, 2020
Billed, net$210.3 $172.7 
Unbilled51.6 58.2 
Total, net$261.9 $230.9 
As of June 30, 2021 and December 31, 2020, the allowances for doubtful accounts was $3.4 million and $3.1 million, respectively.