Thanks David and good afternoon everyone. On the call today, I will provide a more detailed overview of our first quarter financial performance, and then provide our outlook for the second quarter and full year 2018. Following my remarks, we will open up the call to your questions. First quarter was an exceptional performance for Bandwidth, highlighted by accelerated revenue growth and better than expected results across all guided metrics. This was primarily driven by existing customers, but also from new customers, which combined, drove higher usage levels across many of the offerings on our platform. We enjoy strong ongoing demand, as enterprises continue to embed voice, messaging and 911 into their products and services. During the first quarter, our total revenue was $53 million, up 34% year-over-year and $5.5 million above the high end of our guidance range. Within total revenue, CPaaS revenue was $38.9 million, up 23% year-over-year, and $2.4 million above the high end of our guidance range. The remainder of the revenue upside came from other revenue, which contributed the remaining $14.1 million of total revenue, up from $8 million in the first quarter 2017. Other revenue included a onetime benefit of $6.3 million related to the Verizon legal settlement in the first quarter, which was greater than the $4.4 million we had assumed in the guidance on our last call. This was due to the fact, that we were able to reconcile and provide bill credits from amounts previously billed, faster than anticipated, and therefore, recognized the full settlement in the first quarter. Excluding this settlement, our year-over-year total revenue growth would have been 18% in the first quarter of 2018. We ended the first quarter with 1,028 active CPaaS customer accounts, up 26% year-over-year. In addition, our dollar-based net retention rate was 115% compared to 109%, during the first quarter of 2017. Before moving on to profitability metrics; I would like to point out, that I will be discussing non-GAAP results going forward. Our GAAP financial results, along with the full reconciliation between GAAP and non-GAAP results can be found in our earnings release. Our non-GAAP gross profit, which excludes stock based compensation and depreciation was $28.7 million, yielding a gross margin of 54% for the first quarter 2018, up from the $19.1 million and 48% gross margin we achieved in the first quarter of 2017. Excluding the impact of the legal settlement, our non-GAAP gross profit would have been $22.5 million, yielding a gross margin of 48%. First quarter adjusted EBITDA was $10.7 million compared to $6.8 million for the same period last year, which reflects our strong CPaaS performance, as well as the settlement benefit, partially offset by an increase in operating expenses, primarily driven by higher personnel related costs to support our growth. On a GAAP basis, we reported net income of $6.2 million or $0.30 per share, based on 20.5 million weighted average diluted shares outstanding during the first quarter of 2018. Our non-GAAP net income in the first quarter was $6.7 million or $0.33 per share, based on 20.5 million weighted average diluted shares outstanding. Our first quarter non-GAAP earnings per share guidance of $0.07 to $0.10, included the tax adjusted benefit of a portion of the settlement in the amount of $4.4 million. If we normalize for the balance of the settlement of $1.9 million, our non-GAAP net income would have been $5.4 million or $0.26 per diluted share, which is still well above our guidance for the first quarter, primarily due to the strong CPaaS performance, in addition to the lower than expected general and administrative expense in the quarter. During the first quarter, we generated $11.2 million in net cash from operations and $9.8 million in free cash flow, which includes purchases of property and equipment, as well as capitalized software development costs for internal use. I want to remind everyone that 2018 is an investment year for us, and we plan to use our IPO proceeds to more aggressively invest in extending our CPaaS platform, to better serve our customers, and to support our growth. Accordingly, we anticipate our 2018 annual consolidated non-GAAP gross margins to be consistent with our annual 2017 results of 48%. Now, I'd like to [indiscernible] some thoughts regarding our financial outlook, beginning with the full year 2018. In terms of CPaaS revenue, we are increasing our full year guidance to $159 million to $160.5 million, or a growth of 21% at the midpoint of the range. We are increasing our total revenue for 2018 to be in the range of $193.1 million to $194.6 million. As a result, non-GAAP earnings per share is expected to be in the range of approximately breakeven to a loss of $0.11 per share. This outlook assumes weighted average basic shares outstanding of approximately $17.7 million. Turning to our guidance for the second quarter of 2018, we expect CPaaS revenue to be in the range of $38.5 million to $39 million, or up 23% year-over-year at the midpoint of the range. This is consistent with our performance in the first quarter of 2018, which is a function of two primary contributors. First and foremost, our better than expected first quarter performance. Second, we expect one of our large enterprise customers will grow their usage with us in the second quarter, to a higher volume pricing tier, as defined at the beginning of our long term agreement. As this customer continues to expand their usage, along with our overall customer base, we expect sequential revenue growth to resume in the third quarter, as our full year guidance indicates. We expect total revenue to be in the range of $45.1 million to $45.6 million for the second quarter. In looking at total revenue; it is important to keep in mind, that we previously expected to recognize the remainder of the Verizon settlement during the second quarter. However, as discussed a moment ago, that occurred earlier than anticipated in the first quarter of 2018. Non-GAAP earnings per share is expected to be a loss in the range of $0.11 to $0.14 per share. This outlook assumes weighted average basic shares outstanding of approximately $17.7 million. So in summary, we are very pleased with our first quarter execution, and we continue to believe we are well positioned to take advantage of our growing multibillion dollar market opportunity. With that, I will now hand the call back to the operator for the question-and-answer portion of the call.