Significant Customers

12 Months Ended

Dec. 31, 2018

Risks And Uncertainties [Abstract]

Significant Customers

11. Significant Customers

In 2018, 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 2018, 2017, and 2016, IBM accounted for $80.6 million or 22.5%, $76.4 million or 25.4%, and $98.4 million or 30.3% of the Company’s consolidated revenue, respectively. The Company’s accounts receivable from IBM at December 31, 2018 and 2017 amounted to $22.1 million and $21.5 million, respectively.

In 2018, SDI was the Company's second largest customer and accounted for $27.6 million or 7.7%, $34.2 million or 11.4%, and $34.5 million or 10.6% of the Company’s consolidated revenue in 2018, 2017, and 2016, 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, 2018 and 2017 totaled $3.6 million and $4.7 million, respectively.

No other customer accounted for more than 10% of revenue in 2018, 2017, or 2016.