Table:
|  |  | Estimated |
| --- | --- | --- |
|  |  | Useful Life |
|  | Fair value | (in years) |
| Current assets | $37,390 | N/A |
| Fixed assets | 543 | N/A |
| Non-current assets | 74 | N/A |
| Liabilities | (4,422) | N/A |
| Deferred revenue | (15,400) | N/A |
| Customer relationships | 15,300 | 8 |
| Order backlog | 1,400 | 1 |
| Core/developed technology | 18,500 | 4 |
| Deferred tax liability, net | (7,905) | N/A |
| Goodwill | 93,776 | Indefinite |
|  | $139,256 |  |
Paragraphs:
2017 Acquisitions
Cloudmark, Inc
On November 21, 2017 (the “Cloudmark Acquisition Date”), pursuant to the terms of the merger agreement, the Company acquired all shares of Cloudmark, Inc. (“Cloudmark”), a leader in messaging security and threat intelligence for internet service providers and mobile carriers worldwide. As part of the acquisition, Cloudmark’s Global Threat Network was incorporated into Company’s cloud-based Nexus platform, which powers its email, social media, mobile, and SaaS security effectiveness. 

On November 21, 2017 (the “Cloudmark Acquisition Date”), pursuant to the terms of the merger agreement, the Company acquired all shares of Cloudmark, Inc. (“Cloudmark”), a leader in messaging security and threat intelligence for internet service providers and mobile carriers worldwide. As part of the acquisition, Cloudmark’s Global Threat Network was incorporated into Company’s cloud-based Nexus platform, which powers its email, social media, mobile, and SaaS security effectiveness.
The Company believes that with this acquisition, it will benefit from increased messaging threat intelligence from the analysis of billions of daily emails, malicious domain intelligence, and visibility into fraudulent and malicious SMS messages directed to mobile carriers worldwide. The Company also expects to achieve savings in corporate overhead costs for the combined entities. These factors, among others, contributed to a purchase price in excess of the estimated fair value of acquired net identifiable assets and, as a result, goodwill was recorded in connection with the acquisition.
At the Cloudmark Acquisition Date, the consideration transferred was $107,283, net of cash acquired of $31,973.
Per the terms of the merger agreement, unvested stock options and unvested restricted stock units held by Cloudmark employees were canceled and exchanged for the Company’s unvested stock options and unvested restricted stock units, respectively. The fair value of $91 of these unvested awards was attributed to pre-combination services and included in consideration transferred. The fair value of $1,180 was allocated to post-combination
Proofpoint, Inc. Notes to Consolidated Financial Statements (Continued) (dollars and share amounts in thousands, except per share amounts)
services. The unvested awards are subject to the recipient’s continued service with the Company, and $1,180 is recognized ratably as stock-based compensation expense over the required remaining service period.
The following table summarizes the fair values of tangible assets acquired, liabilities assumed, intangible assets and goodwill:
Question:
How long is the estimated useful life for the Goodwill?
Answer: Indefinite