On April 1, 2020 (the acquisition date), we completed the acquisition of privately-held exocad for a total purchase consideration of $430.0 million and exocad became a wholly-owned subsidiary. exocad is a German dental CAD/CAM software company that offers fully integrated workflows to dental labs and dental practices. We believe the synergies from the acquisition will strengthen our digital platform by adding exocads expertise in restorative dentistry, implantology, guided surgery, and smile design to extend our digital solutions and pave the way for new, seamless cross-discipline dentistry in lab and at chairside. The total purchase consideration consisted of the following (in thousands): Cash paid to exocad stockholders $ 412,287 Cash paid to settle exocad's bank debt 17,691 Total purchase consideration paid $ 429,978 The following table summarizes the allocation of purchase price to assets acquired and liabilities assumed as of April 1, 2020 which are considered preliminary and therefore subject to change (in thousands): Goodwill $ 344,238 Identified intangible assets 118,700 Cash and cash equivalents 9,190 Deferred tax liabilities (35,419) Other assets (liabilities), net (6,731) Total $ 429,978 Goodwill represents the excess of the purchase price over the fair value of the underlying net tangible and identifiable intangible assets, and represents the expected synergies of the transaction and the knowledge and experience of the workforce in place. None of this goodwill is deductible for tax purposes. Under the applicable accounting guidance, goodwill will not be amortized but will be tested for impairment on an annual basis or more frequently if certain indicators are present. We allocated approximately $300.7 million of goodwill to our Systems and Services reporting unit (formerly the "Scanner and Services" reporting unit prior to its renaming during the second quarter of 2020) and approximately $43.5 million of the goodwill to our Clear Aligner reporting unit (Refer to Note 5 "Goodwill and Intangible Assets" of the Notes to Condensed Consolidated Financial Statements for additional details) . Our reporting units are the same as our operating segments. Acquisition related costs are recognized separately from the business combination and expensed as incurred. The following table presents details of the identified intangible assets acquired (in thousands, except years): Weighted Average Amortization Period (in years) Fair Value Intangible assets subject to amortization: Existing technology 10 $ 87,000 Customer relationships 10 21,500 Tradenames 7 9,800 Intangible assets not subject to amortization: In-process Research and Development ("IPR&amp;D") 400 Total intangible assets $ 118,700 We believe the amount of purchased intangible assets recorded above represent the fair values and approximate the amount a market participant would pay for these intangible assets as of the acquisition date. Existing technology represents the estimated fair value of exocads core technology that has reached technological feasibility. We valued the existing technology using the multi-period excess earnings method under the income approach. The economic useful life of existing technology was determined by considering the life cycle of the technology and related cash flows. Customer relationships represent the fair value of future projected revenue that will be derived from sales of products to existing customers. Customer relationships were valued using the with-and-without method under the income approach. The economic useful life for customer relationships was based on historical customer attrition rates. Tradenames relates to the exocad tradenames that are recognized within the industry. The fair value was determined using the relief-from-royalty method under the income approach. The economic useful life of tradenames was determined by benchmarking against similar transactions entered into by peer companies. IPR&amp;D refers to the fair value of projects that are not yet completed but have potential value to the company. Deferred tax liabilities were recorded for significant basis differences primarily to reflect the tax effect of fair value adjustments made to the beginning balance of the intangible assets and deferred revenue as of the acquisition date (Refer to Note 13 "Accounting for Income Taxes" of the Notes to Condensed Consolidated Financial Statements for additional details). Our condensed consolidated financial statements include the operating results of exocad from the acquisition date. Separate post-acquisition operating results and pro forma results of operations for this acquisition have not been presented as the effect is not material to our financial results.