Total revenue for the fourth quarter of 2013 was $8.0 million, comprised of $7.8 million for product and service revenue and $0.2 million for research and development (R&D) contract revenue. This compares to total revenue of $5.9 million in the fourth quarter of 2012, which was comprised of $5.7 million for product and service revenue and $0.2 million for R&D contract revenue.
For the full year 2013, total revenue was $26.6 million, comprised of $25.1 million for product and service revenue and $1.5 million for R&D contract revenue. This compares to total revenue of $26.1 million in 2012, which was comprised of $24.4 million for product and service revenue and $1.7 million for R&D contract revenue.
The Company shipped 279 units during the fourth quarter of 2013 compared to 518 units in the fourth quarter of 2012. For the full year, the Company shipped 918 units compared to 1,391 in 2012.
Total cost of revenue for the fourth quarter of 2013 was $11.2 million, comprised of $10.6 million for cost of product and service revenue and $0.6 million for cost of R&D contract revenue. This compares to total cost of revenue of $9.5 million in the fourth quarter of 2012, which was comprised of $9.1 million for cost of product and service revenue and $0.4 million for cost of R&D contract revenue.
For the full year 2013, total cost of revenue was $37.8 million, comprised of $35.3 million for cost of product and service revenue and $2.5 million for cost of R&D contract revenue. This compares to total cost of revenue of $40.5 million in 2012, which was comprised of $37.7 million for cost of product and service revenue and $2.8 million for cost of R&D contract revenue.
R&D expenses for the fourth quarter and year ended 2013 were $0.8 million and $3.1 million, respectively. This compares to the fourth quarter and year ended 2012 of $1.3 million and $5.4 million, respectively.
Selling, general and administrative (SG&A) expenses for the fourth quarter and year ended 2013 were $3.5 million and $12.3 million, respectively. This compares to the fourth quarter and year ended 2012 of $4.0 million and $14.6 million, respectively.