Summary of Significant Accounting Policies	3 Months Ended
Mar. 31, 2017
Summary of Significant Accounting Policies
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies Basis of Presentation The unaudited interim consolidated financial statements included herein have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (SEC). Accordingly, they do not include all information and disclosures necessary for a presentation of our financial position, results of operations and cash flows in conformity with generally accepted accounting principles in the United States of America (GAAP) for annual financial statements. In the opinion of management, these unaudited interim consolidated financial statements reflect the elimination of all intercompany accounts and transactions and all adjustments, consisting primarily of normal recurring accruals, necessary for a fair presentation of our financial position and results of operations and cash flows for the periods presented. The results of operations for interim periods are not necessarily indicative of the results for the full year. These unaudited interim consolidated financial statements should be read in conjunction with the audited financial statements for the year ended December 31, 2016 and accompanying notes thereto included in our annual report on Form 10-K filed with the SEC on March 13, 2017. Use of Estimates The preparation of financial statements in conformity with GAAP, requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of income and expenses during the reporting period. Actual results could differ from such estimates. Investments Investments purchased with a maturity of more than three months and less than twelve months are classified as short-term investments. Investments purchased with a remaining maturity greater than twelve months are classified as long-term investments. We plan to hold these investments to maturity and have classified these investments as such as defined by GAAP. Recent Accounting Pronouncements In February 2016, the Financial Accounting Standard Board (FASB) issued Accounting Standards Update (ASU) 2016-02, Leases, which requires that lease arrangements longer than 12 months result in an entity recognizing an asset and liability. The updated guidance is effective for interim and annual periods beginning after December 15, 2018, and early adoption is permitted. We have not evaluated the impact of the updated guidance on our interim or annual consolidated financial statements. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows, which amends the guidance in Accounting Standards Codification (ASC) 230 on the classification of certain cash receipts and payments in the statement of cash flows. The primary purpose of the ASU is to reduce the diversity in practice that has resulted from the lack of consistent principles on this topic. The guidance in the ASU is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. We do not expect the adoption of this ASU to have a material effect on our interim or annual consolidated financial statements.

2. Summary of Significant Accounting Policies

Basis of Presentation

The unaudited interim consolidated financial statements included herein have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (SEC). Accordingly, they do not include all information and disclosures necessary for a presentation of our financial position, results of operations and cash flows in conformity with generally accepted accounting principles in the United States of America (GAAP) for annual financial statements. In the opinion of management, these unaudited interim consolidated financial statements reflect the elimination of all intercompany accounts and transactions and all adjustments, consisting primarily of normal recurring accruals, necessary for a fair presentation of our financial position and results of operations and cash flows for the periods presented. The results of operations for interim periods are not necessarily indicative of the results for the full year. These unaudited interim consolidated financial statements should be read in conjunction with the audited financial statements for the year ended December 31, 2016 and accompanying notes thereto included in our annual report on Form 10-K filed with the SEC on March 13, 2017.

Use of Estimates

The preparation of financial statements in conformity with GAAP, requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of income and expenses during the reporting period. Actual results could differ from such estimates.

Investments

Investments purchased with a maturity of more than three months and less than twelve months are classified as short-term investments. Investments purchased with a remaining maturity greater than twelve months are classified as long-term investments. We plan to hold these investments to maturity and have classified these investments as such as defined by GAAP.

Recent Accounting Pronouncements

In February 2016, the Financial Accounting Standard Board (FASB) issued Accounting Standards Update (ASU) 2016-02, Leases, which requires that lease arrangements longer than 12 months result in an entity recognizing an asset and liability. The updated guidance is effective for interim and annual periods beginning after December 15, 2018, and early adoption is permitted. We have not evaluated the impact of the updated guidance on our interim or annual consolidated financial statements.

In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows, which amends the guidance in Accounting Standards Codification (ASC) 230 on the classification of certain cash receipts and payments in the statement of cash flows. The primary purpose of the ASU is to reduce the diversity in practice that has resulted from the lack of consistent principles on this topic. The guidance in the ASU is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. We do not expect the adoption of this ASU to have a material effect on our interim or annual consolidated financial statements.