Significant Customers

12 Months Ended

Dec. 31, 2017

11.	Significant Customers

In 2017, International Business Machines Corporation (IBM) was the Company’s largest customer. During the 2017 third quarter, the NTS Agreement with IBM was extended for two years and now expires on December 31, 2019. In 2017, 2016, and 2015, IBM accounted for $76.4 million or 25.4%, $98.4 million or 30.3%, and $99.2 million or 26.9% of the Company’s consolidated revenue, respectively. The Company’s accounts receivable from IBM at December 31, 2017 and 2016 amounted to $21.5 million and $28.0 million, respectively.

In 2017, SDI was the Company's second largest customer and accounted for $34.2 million or 11.4%, $34.5 million or 10.6%, and $44.0 million or 11.9% of the Company’s consolidated revenue in 2017, 2016, and 2015, respectively. SDI acts as a vendor manager for Lenovo, and all of the Company's revenue generated through SDI relates to CTG employees working at Lenovo. The Company's accounts receivable from SDI at December 31, 2017 and 2016 totaled $4.7 million and $5.6 million, respectively.

No other customer accounted for more than 10% of revenue in 2017, 2016, or 2015.