Revenue
For the three months ended September 30, 2020, our revenue decreased by $68.3 million, or 18.3%, to $305.3 million from $373.5 million for the three months ended September 30, 2019. We experienced revenue declines on all of our segments due to lower transaction volumes as a result of COVID-19. Our ITPS, HS, and LLPS segments constituted 76.8%, 17.7%, and 5.5% of total revenue, respectively, for the three months ended September 30, 2020, compared to 78.3%, 16.7%, and 5.0%, respectively, for the three months ended September 30, 2019. The revenue changes by reporting segment were as follows:
ITPS— For the three months ended September 30, 2020, revenue attributable to our ITPS segment decreased by $58.2 million, or 19.9% compared to the same period in the prior year. The majority of this revenue decline is attributable to exiting contracts and statements of work in late 2019 from certain customers with revenue that we believe was unpredictable, non-recurring and were not a strategic fit to Company’s long-term success or unlikely to achieve the Company’s long-term target margins (“transition revenue”) in addition to lower transaction volumes as a result of COVID-19.
HS— For the three months ended September 30, 2020, revenue attributable to our HS segment decreased by $7.9 million, or 12.8% compared to the same period in the prior year primarily due to impact of COVID-19 on our healthcare customers.
LLPS— For the three months ended September 30, 2020, revenue attributable to our LLPS segment decreased by $2.1 million, or 11.2% compared to the same period in the prior year primarily due to a decline in legal claims administration services.
Cost of Revenue
For the three months ended September 30, 2020, our direct costs decreased by $61.2 million, or 20.7%, compared to the three months ended September 30, 2019. On ITPS and HS segments, the decrease was primarily attributable to the corresponding decline in revenues. Costs on ITPS segment decreased by $58.2 million, or 24.1% and HS segment decreased by $3.3 million, or 7.7%. Costs on LLPS segment increased by $0.2 million, or 2.3%.
Cost of revenue for the three months ended September 30, 2020 was 76.7% compared to the 79.1% for the comparable same period in the prior year, as a percentage of revenues a decrease by 2.4%. The decrease in cost of revenues was primarily due to a decrease in employee-related costs of $32.4 million, lower travel costs of $1.6 million, lower infrastructure and maintenance costs of $5.6 million and other operating costs of $8.4mn. The lower costs were attributable to cost and capacity management as a result of COVID-19 and transition revenue impact during the three months ended September 30, 2020.
Selling, General and Administrative Expenses
SG&A expenses decreased $5.5 million, or 11.4%, to $42.8 million for the three months ended September 30, 2020, compared to $48.3 million for the three months ended September 30, 2019. The decrease was primarily attributable to lower professional and legal expenses by $2.3 million, lower travel costs of $1.5 million and lower infrastructure and maintenance costs of $1.0 million.
SG&A expenses increased as a percentage of revenues to 14.0% in 2020 as compared to 12.9% in 2019. The increase, as a percentage of revenues by 1.1%, was primarily due to the decline in revenues brought on by the COVID-19 pandemic and the transition revenue.
Depreciation & Amortization
Total depreciation and amortization expense was $22.1 million and $25.1 million for the three months ended September 30, 2020 and 2019, respectively. The decrease in total depreciation and amortization expense by $3.0mn was