Table:
Reconciliation of Non-GAAP measure - operating expenses and operating income from continuing operations, excluding certain items (in thousands)
Years Ended December 31,
2019
2018
Gross profit from continuing operations, as reported
$ 315,652
$365,607
Adjustments to gross profit:
Stock-based compensation
525
742
Facility expansion and relocation costs
3,891
1,328
Acquisition-related costs
8,290
569
Non-GAAP gross profit
328,358
368,246
Non-GAAP gross margin
41.6%
51.2%
Operating expenses from continuing operations, as reported
261,264
194,054
Adjustments:
Amortization of intangible assets
(12,168)
(5,774)
Stock-based compensation
(6,803)
(8,961)
Acquisition-related costs
(12,002)
(1,726)
Facility expansion and relocation costs
(948)
(518)
Restructuring charges
(5,038)
(4,239)
Non-GAAP operating expenses
224,305
172,836
Non-GAAP operating income
$  104,053
$  195,410

text: Non-GAAP Results
text: Management uses non-GAAP operating income and non-GAAP EPS to evaluate business performance without the impacts of certain non-cash charges and other charges which are not part of our usual operations. We use these non- GAAP measures to assess performance against business objectives, make business decisions, including developing budgets and forecasting future periods. In addition, management’s incentive plans include these non-GAAP measures as criteria for achievements. These non-GAAP measures are not in accordance with U.S. GAAP and may differ from non- GAAP methods of accounting and reporting used by other companies. However, we believe these non-GAAP measures provide additional information that enables readers to evaluate our business from the perspective of management. The presentation of this additional information should not be considered a substitute for results prepared in accordance with U.S. GAAP.
text: The non-GAAP results presented below exclude the impact of non-cash related charges, such as stock-based compensation and amortization of intangible assets. In addition, they exclude discontinued operations and other nonrecurring items such as acquisition-related costs and restructuring expenses, as they are not indicative of future performance. The tax effect of our non-GAAP adjustments represents the anticipated annual tax rate applied to each non-GAAP adjustment after consideration of their respective book and tax treatments and effect of adoption of the Tax Act.

Questions and answers:
question: What was the stock-based compensation in 2019?
answer: 525
scale: thousand
question: What was the Gross profit from continuing operations, as reported in 2019?
answer: 315,652
scale: thousand
question: What does the non-GAAP results exclude?
answer: the impact of non-cash related charges, such as stock-based compensation and amortization of intangible assets.
question: What was the change in the Gross profit from continuing operations, as reported between 2018 and 2019?
answer: -49955
derivation: $315,652-$365,607
scale: thousand
question: What was the change in stock-based compensation between 2018 and 2019?
answer: -217
derivation: 525-742
scale: thousand
question: What was the percentage change in acquisition-related costs between 2018 and 2019?
answer: 1356.94
derivation: ((8,290-569)/569) * 100
scale: percent