| | | | |
Hollysys Automation Technologies Ltd March 4, 2021 | | | Page 8 | |
The Company’s total revenues can also be presented in segments as shown in the following chart:
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
(In USD thousands) | | | | | | | | | | | | | | | | | | | |
| | Three months ended December 31, | | Six months ended December 31, | |
| | 2020 | | | | | 2019 | | 2020 | | | | | 2019 | |
| | $ | | | % to Total Revenue | | | | | $ | | | % to Total Revenue | | | | | $ | | | % to Total Revenue | | | | | $ | | | % to Total Revenue | |
Industrial Automation | | | 92,889 | | | | 47.6 | % | | | | | 69,291 | | | | 40.7 | % | | | | | 174,819 | | | | 53.8 | % | | | | | 133,927 | | | | 45.6 | % |
Rail Transportation Automation | | | 81,269 | | | | 41.6 | % | | | | | 78,823 | | | | 46.3 | % | | | | | 109,965 | | | | 33.9 | % | | | | | 123,399 | | | | 42.1 | % |
Mechanical and Electrical Solution | | | 21,170 | | | | 10.8 | % | | | | | 21,995 | | | | 13.0 | % | | | | | 40,011 | | | | 12.3 | % | | | | | 36,012 | | | | 12.3 | % |
Total | | | 195,328 | | | | 100.0 | % | | | | | 170,109 | | | | 100.0 | % | | | | | 324,795 | | | | 100.0 | % | | | | | 293,338 | | | | 100.0 | % |
Overall gross margin excluding non-cash amortization of acquired intangibles (non-GAAP gross margin) was 37.7% for the three months ended December 31, 2020, as compared to 36.3% for the same period of the prior year. The non-GAAP gross margin for integrated contracts, product sales, and services rendered were 28.0%, 85.6% and 59.8% for the three months ended December 31, 2020, as compared to 28.0%, 66.4% and 62.6% for the same period of the prior year, respectively. The gross margin fluctuated mainly due to the different revenue mix with different margins. The GAAP overall gross margin which includes non-cash amortization of acquired intangibles was 37.7% for the three months ended December 31, 2020, as compared to 36.3% for the same period of the prior year. The GAAP gross margin for integrated contracts, product sales, and service rendered was 27.9%, 85.6% and 59.8% for the three months ended December 31, 2020, as compared to 27.9%, 66.4% and 62.6% for the same period of the prior year, respectively.
Selling expenses were $10.3 million for the three months ended December 31, 2020, represented a decrease of $0.1 million or 1.3% compared to $10.4 million for the same quarter of the prior year. Presented as a percentage of total revenues, selling expenses were 5.3% and 6.1% for the three months ended December 31, 2020, and 2019, respectively.
General and administrative expenses, excluding non-cash share-based compensation expenses (non-GAAP G&A expenses), were $13.6 million for the quarter ended December 31, 2020, represented an increase of $3.1 million or 28.8% compared to $10.6 million for the same quarter of the prior year. Presented as a percentage of total revenues, non-GAAP G&A expenses were 7.0% and 6.2% for quarters ended December 31, 2020 and 2019, respectively. The GAAP G&A expenses which include the non-cash share-based compensation expenses were $14.4 million and $10.6 million for the three months ended December 31, 2020 and 2019, respectively.