Revenue by Type
| | | | | | | | | | | | |
| | Three Months Ended | Six Months Ended |
| | June 30, | | June 30, |
| | 2021 | | 2020 | | 2021 | | 2020 |
Devices: | | | | | | | | | | | | |
MRI Compatible IV Infusion Pump Systems | | $ | 2,456,767 | | $ | 1,875,159 | | $ | 5,960,114 | | $ | 4,539,993 |
MRI Compatible Patient Vital Signs Monitoring Systems | | | 3,377,719 | | | 1,927,473 | | | 5,981,549 | | | 4,546,988 |
Total Devices revenue | | | 5,834,486 | | | 3,802,632 | | | 11,941,663 | | | 9,086,981 |
Disposables, services and other | | | 3,490,969 | | | 2,535,548 | | | 6,126,435 | | | 5,467,449 |
Amortization of extended warranty agreements | | | 484,968 | | | 456,512 | | | 966,321 | | | 917,803 |
Total revenue | | $ | 9,810,423 | | $ | 6,794,692 | | $ | 19,034,419 | | $ | 15,472,233 |
For the three months ended June 30, 2021, revenue increased $3.0 million, or 44.4 percent, to $9.8 million from $6.8 million for the same period in 2020.
Revenue from sales in the U.S. increased $3.4 million, or 73.2 percent, to $8.0 million for the second quarter 2021, from $4.6 million for the second quarter 2020. Revenue from sales internationally decreased $(0.4) million, or (17.9) percent, to $1.8 million for the second quarter 2021, from $2.2 million for the second quarter 2020. Domestic sales accounted for 82.0 percent of revenue for the second quarter 2021, compared to 68.3 percent for the second quarter 2020.
Revenue from sales of devices increased $2.0 million, or 53.4 percent, to $5.8 million for the three months ended June 30, 2021, from $3.8 million for the same period in 2020.
The average selling price of our MRI compatible IV infusion pump system during the three months ended June 30, 2021 was approximately $41,600, compared to approximately $30,200 for the same period in 2020. The increase in ASP is the result of a favorable product and geographic sales mix when compared to the same period in 2020.
The average selling price of our MRI compatible patient vital signs monitoring system during the three months ended June 30, 2021 was approximately $39,700, compared to approximately $30,600 for the same period in 2020. The increase in ASP relates to a favorable product and geographic sales mix when compared to the same period in 2020.
Revenue from sales of our disposables, service and other increased $1.0 million, or 37.7 percent, to $3.5 million for the three months ended June 30, 2021, from $2.5 million for the same period in 2020. Revenue from the amortization of extended maintenance contracts was consistent at $0.5 million for the three months ended June 30, 2021 and 2020.
For the six months ended June 30, 2021, revenue increased $3.5 million, or 23.0 percent, to $19.0 million from $15.5 million for the same period in 2020.
Revenue from sales in the U.S. increased $4.3 million, or 39.7 percent, to $15.3 million for the six months ended June 30, 2021, from $11.0 million for the same period in 2020. Revenue from sales internationally decreased $(0.8) million, or (17.5) percent, to $3.7 million for the six months ended June 30, 2021, from $4.5 million for the same period in 2020. Domestic sales accounted for 80.5 percent of revenue for the six months ended June 30, 2021, compared to 70.9 percent for the same period in 2020.
Revenue from sales of devices increased $2.8 million, or 31.4 percent, to $11.9 million for the six months ended June 30, 2021, from $9.1 million for the same period in 2020.
The average selling price of our MRI compatible IV infusion pump system during the six months ended June 30, 2021 was approximately $35,900, compared to approximately $30,100 for the same period in 2020. The increase in ASP relates to a favorable product and geographic sales mix when compared to the same period in 2020.
The average selling price of our MRI compatible patient vital signs monitoring system during the six months ended June 30, 2021 was approximately $39,100, compared to approximately $33,100 for the same period in 2020. The increase in ASP relates to favorable product and geographic sales mix when compared to the same period in 2020.
Revenue from sales of our disposables, service and other increased $0.6 million, or 12.1 percent, to $6.1 million for the six months ended June 30, 2021, from $5.5 million for the same period in 2020. Revenue from the amortization of extended maintenance