pre_text: Horizon Clinicals and Series2000 Revenue Cycle Discontinued Operation Two of the product offerings acquired with the EIS Business in 2017, Horizon Clinicals and Series2000 Revenue Cycle, were sunset after March 31, 2018. The decision to discontinue maintaining and supporting these solutions was made prior to our acquisition of the EIS Business and, therefore, they are presented below as discontinued operations. Until the end of the first quarter of 2018, we were involved in ongoing maintenance and support for these solutions until customers transitioned to other platforms. No disposal gains or losses were recognized during the year ended December 31, 2018 related to these discontinued solutions. We had $0.9 million of accrued expenses associated with the Horizon Clinicals and Series2000 Revenue Cycle businesses on the consolidated balance sheets as of December 31, 2018 The following table summarizes the major income and expense line items of these discontinued solutions, as reported in the consolidated statements of operations for the years ended December 31, 2018 and 2017:
table: (In thousands) 2018 2017
table: Major classes of line items constituting pretax profit (loss) of discontinued operations for Horizon Clinicals and Series2000 Revenue Cycle:
table: Revenue:
table: Software delivery, support and maintenance $9,441 $10,949
table: Client services 404 1,044
table: Total revenue 9,845 11,993
table: Cost of revenue:
table: Software delivery, support and maintenance 2,322 2,918
table: Client services 830 261
table: Total cost of revenue 3,152 3,179
table: Gross profit 6,693 8,814
table: Research and development 1,651 1,148
table: Income from discontinued operations for Horizon Clinicals and Series2000 Revenue Cycle before income taxes 5,042 7,666
table: Income tax provision (1,311) (2,990)
table: Income from discontinued operations, net of tax for Horizon Clinicals and Series2000 Revenue Cycle $3,731 $4,676
question: Analyse this data from a financial earnings document. What is the change in Cost of revenue of Client services from 2018 to 2017?