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Revenue
 3 Months Ended
Mar. 31, 2023
Revenue from Contract with Customer [Abstract]  
Revenue Revenue
Our disaggregated revenues were as follows (in thousands):
Three Months Ended
 March 31,
20232022
Royalties$99,640 $69,605 
Product sales, net
  Sales of bulk rHuPH2022,069 16,448 
Sale of proprietary products27,961 5,692 
Sale of device partnered products10,764 — 
Total product sales, net$60,794 $22,140 
Revenues under collaborative agreements
  Upfront license and target nomination fees— 25,000 
  Device Licensing and development revenue1,709 534 
Total revenues under collaborative agreements$1,709 $25,534 
Total revenues$162,143 $117,279 
During the three months ended March 31, 2023, we recognized revenue related to licenses granted to partners in prior periods in the amount of $99.6 million. This amount represents royalties earned in the current period. We also recognized revenue of $0.4 million during the three months ended March 31, 2023 that had been included in deferred revenues in the condensed consolidated balance sheets as of December 31, 2022.
Accounts receivable, other contract assets and deferred revenues (contract liabilities) from contracts with customers, including partners, consisted of the following (in thousands):
March 31, 2023December 31, 2022
Accounts receivable, net$162,545 $186,970 
Other contract assets32,338 44,102 
Deferred revenues5,499 5,499 
As of March 31, 2023, the amounts included in the transaction price of our contracts with customers, including collaboration partners, and allocated to goods and services not yet provided were $123.6 million, of which $118.1 million relates to unfulfilled product purchase orders and $5.5 million has been collected and is reported as deferred revenues in the condensed consolidated balance sheets. The unfulfilled product purchase orders are estimated to be delivered by the end of 2024. Of the total deferred revenues of $5.5 million, $3.2 million is expected to be used by our customers within the next 12 months.
We recognized contract assets of $32.3 million as of March 31, 2023, which related to development milestones deemed probable of receipt for intellectual property licenses granted to partners in prior periods and for goods or services when control has transferred to the customer, and corresponding revenue is recognized on an over time basis but is not yet billable to the customer in accordance with the terms of the contract.