Recent Accounting Pronouncements	12 Months Ended
Dec. 31, 2018
Accounting Changes And Error Corrections [Abstract]
Recent Accounting Pronouncements	3. RECENT ACCOUNTING PRONOUNCEMENTS The Company reviews new accounting pronouncements as they are issued or proposed by the Financial Accounting Standards Board (“FASB”). Recently Implemented Accounting Standards In February 2018, the FASB issued Accounting Standards Update (“ASU”) 2018-02, Income Statement – Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. This ASU gives companies the option to reclassify to retained earnings any tax effects related to items in accumulated other comprehensive income or loss that are stranded due to the Tax Cuts and Jobs Act (the “Tax Act”). Companies are able to early adopt this ASU in any interim or annual period for which financial statements have not yet been issued and apply it either (1) in the period of adoption or (2) retrospectively to each period in which the income tax effects of the Tax Act related to items in accumulated other comprehensive income or loss are recognized. When adopted, the ASU requires all entities to make new disclosures, regardless of whether they elect to reclassify stranded amounts. Companies are required to disclose whether or not they elected to reclassify the tax effects related to the Tax Act as well as their policy for releasing income tax effects from accumulated other comprehensive income or loss. The guidance is effective for annual reporting periods beginning after December 15, 2018, and interim periods within those annual reporting periods with early adoption permitted. On January 1, 2018, the Company elected to early adopt the ASU and applied the amendments in the period of adoption. As a result, the Company reclassified $1.1 million of “stranded” tax effects of the Tax Act from accumulated other comprehensive income (loss) to accumulated deficit in the accompanying consolidated balance sheet and the accompanying consolidated statements of changes in stockholders’ equity. See Note 13–Derivative Instruments and Hedging Activities for additional disclosure. In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities. ASU 2017-12 aims to improve reporting of hedging relationships to better portray the economic results of an entity’s risk management activities in its financial statements and simplify the application of the hedge accounting guidance. This ASU is effective for fiscal years beginning after December 15, 2018 and interim periods within those annual reporting periods with early adoption permitted. For cash flow and net investment hedges existing as of the adoption date, the guidance requires a cumulative-effect adjustment as of the beginning of the fiscal year that an entity adopts the amendments; however, the presentation and disclosure guidance should be applied prospectively. The Company adopted ASU 2017-12 during the second quarter of 2018. The impact of the adoption was not material to the Company’s consolidated financial statements; as a result, no cumulative effect adjustment to beginning retained earnings was required. See Note 13–Derivative Instruments and Hedging Activities for additional disclosure. In May 2017, the FASB issued ASU 2017-09, Compensation–Stock Compensation (Topic 718): Scope of Modification Accounting. This ASU was issued to provide clarity and reduce diversity in practice regarding the application of guidance on the modification of equity awards. The guidance is effective for annual reporting periods beginning after December 15, 2017, and interim periods within those annual reporting periods with early adoption permitted and should be applied prospectively to an award modified on or after the adoption date. The Company adopted this standard on January 1, 2018. The adoption of this ASU did not have a material impact on the Company’s consolidated financial statements as the Company historically has accounted for all modifications in accordance with Topic 718 and has not been subject to the exception described under this ASU. In November 2016, the FASB issued ASU 2016-18, Restricted Cash–a Consensus of the FASB Emerging Issues Task Force. This ASU requires companies to include restricted cash balances with cash and cash equivalent balances in the statement of cash flows. The guidance is effective for annual reporting periods beginning after December 15, 2017, and interim periods within those annual reporting periods with early adoption permitted, and should be applied using a retrospective transition method. The Company adopted this standard on January 1, 2018 using the retrospective transition method. For the years ended December 31, 2017 and 2016, the adoption of ASU 2016-18 increased net cash used in investing activities by $0.4 million and decreased net cash used in investing activities by $0.2 million, respectively, when compared to the previously reported amounts in the accompanying consolidated statements of cash flows. In October 2016, the FASB issued ASU 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory. ASU 2016-16 simplifies the income tax accounting of intra-entity transfers of an asset other than inventory by requiring an entity to recognize the income tax effect when the transfer occurs. The guidance is effective for annual reporting periods beginning after December 15, 2017, including interim reporting periods within those annual reporting periods and early adoption is permitted. The Company adopted this standard on January 1, 2018 using a modified retrospective transition method. The adoption of ASU 2016-16 did not have a material impact on the Company’s consolidated financial statements. In August 2016, the FASB issued ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments. This ASU provides guidance on the presentation and classification of eight specific cash flow issues that previously resulted in diversity in practice. The ASU is effective for annual periods beginning after December 15, 2017 and interim periods therein. The Company adopted this standard on January 1, 2018 using a retrospective transition method for each period presented. The adoption of ASU 2016-15 did not have a material impact on the Company’s consolidated statements of cash flows. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606), which supersedes the revenue recognition requirements in Topic 605, Revenue Recognition. Under this ASU and subsequently issued amendments, revenue is recognized at the time a good or service is transferred to a customer for the amount of consideration expected to be received. Entities may use a full retrospective approach or report the cumulative effect as of the date of adoption. The Company adopted this standard and subsequently issued amendments on January 1, 2018, using the modified retrospective transition method. The adoption of ASU 2014-09 and its subsequently issued amendments did not have a material impact on the Company’s existing or new contracts as of January 1, 2018; therefore, no cumulative adjustment to beginning retained earnings was required as a result of adoption. See Note 2–Summary of Significant Accounting Policies subtopic “Revenue Recognition” and Note 4–Revenues for additional disclosure. Recently Issued Accounting Standards In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). The new standard is intended to provide enhanced transparency and comparability by requiring lessees to record right-of-use assets and corresponding lease liabilities on the balance sheet. The new guidance will require the Company to continue to classify leases as either operating or financing, with classification affecting the pattern of expense recognition in the income statement. Accounting by lessors will remain largely unchanged from current GAAP. Lessees and lessors are also required to disclose qualitative and quantitative information about leasing arrangements to enable financial statement users to assess the amount, timing and uncertainty of cash flows arising from leases. In July 2018, the FASB issued ASU 2018-10, Codification Improvements to Topic 842, Leases, and ASU 2018-11, Leases (Topic 842) Targeted Improvements. ASU 2018-10 clarifies how to apply certain aspects of ASU 2016-02. ASU 2018-11 provides entities the option of recognizing the cumulative effect of applying the new standard as an adjustment to beginning retained earnings in the year of adoption while continuing to present all prior periods under previous lease accounting guidance. These ASUs will be effective for annual periods beginning after December 15, 2018, and interim periods therein with early adoption permitted. The Company adopted these ASU’s (collectively, “ASC 842”) on January 1, 2019 using the modified retrospective method. The new standard also provides a number of optional provisions, known as practical expedients, which companies may elect to adopt to facilitate implementation. Upon adoption, the Company elected the package of practical expedients which, among other items, precludes the Company from needing to reassess 1) whether any expired or existing contracts are or contain leases, 2) the lease classification of any expired or existing leases, and 3) initial direct costs for any existing leases. In preparation for the adoption of ASC 842, the Company is establishing new processes and internal controls and is also implementing a new lease accounting information system to enable the preparation of financial information to comply with the new lease accounting and disclosure requirements. The Company is finalizing its analysis of the expected impacts that the adoption of ASC 842 will have on its consolidated financial statements. Based on preliminary estimates, the Company expects to record right-of-use assets and corresponding lease liabilities of approximately $130.0 million as of January 1, 2019 based on the present value of future minimum lease payments. The Company is currently analyzing other impacts the adoption of ASC 842 may have, however it does not expect a material impact on its consolidated statements of comprehensive income (loss), consolidated statements of cash flows or debt covenant calculations. For more information regarding the Company’s commitments under long-term operating leases requiring annual minimum lease payments, refer to Note 15–Commitments and Contingencies. In July 2018, the FASB issued ASU 2018-09, Codification Improvements, which clarifies, corrects and makes minor improvements to a wide variety of topics in the ASC. The amendments make the ASC easier to understand and apply by eliminating inconsistencies and providing clarifications. The transition and effective dates are based on the facts and circumstances of each amendment, with some amendments becoming effective upon issuance of the ASU, and others becoming effective for annual periods beginning after December 15, 2018. Included in this ASU are amendments to ASC 718-740, Compensation - Stock Compensation - Income Taxes, which clarify that an entity should recognize excess tax benefits in the period in which the amount of deduction is determined. The Company is evaluating the effect of the amendments within ASU 2018-09, but does not expect a material impact on the Company's financial position or results of operations. In August 2018, the FASB issued ASU 2018-15, Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract. This ASU generally aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. Capitalized implementation costs related to a hosting arrangement that is a service contract will be amortized over the term of the hosting arrangement, beginning when the module or component of the hosting arrangement is ready for its intended use. The ASU also adds certain disclosure requirements related to implementation costs incurred for internal-use software and cloud computing arrangements. ASU 2018-15 is effective for fiscal years beginning after December 15, 2019 and interim periods within those fiscal years, with early adoption permitted. The amendments in this ASU can be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. The Company is evaluating the effect of adopting this new accounting guidance, but does not expect adoption will have a material impact on the Company’s financial position or results of operations. In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820). The ASU eliminates certain disclosures related to the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy. The ASU also adds new disclosure requirements for Level 3 measurements. This ASU is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years, with early adoption permitted for any eliminated or modified disclosures. The Company is evaluating the effect of adopting this new accounting guidance, but does not expect adoption will have a material impact on the Company's disclosures. In October 2018, the FASB issued ASU 2018-16, Derivatives and Hedging—Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate for Hedge Accounting Purposes, which expands the list of United States benchmark interest rates permitted in the application of hedge accounting. The amendments in this ASU allow use of the Overnight Index Swap (OIS) rate based on the Secured Overnight Financing Rate (SOFR) as a U.S. benchmark interest rate for hedge accounting purposes under Topic 815, Derivatives and Hedging. The amendments in this ASU are effective for annual periods beginning after December 15, 2018 and interim periods within those annual periods. The Company will adopt this guidance in the first quarter of 2019 using a prospective method. The Company does not expect adoption will have a material impact on the Company’s consolidated financial statements.

Recent Accounting Pronouncements

12 Months Ended

Dec. 31, 2018

Accounting Changes And Error Corrections [Abstract]

3. RECENT ACCOUNTING PRONOUNCEMENTS

The Company reviews new accounting pronouncements as they are issued or proposed by the Financial Accounting Standards Board (“FASB”).

Recently Implemented Accounting Standards

In February 2018, the FASB issued Accounting Standards Update (“ASU”) 2018-02, Income Statement – Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. This ASU gives companies the option to reclassify to retained earnings any tax effects related to items in accumulated other comprehensive income or loss that are stranded due to the Tax Cuts and Jobs Act (the “Tax Act”). Companies are able to early adopt this ASU in any interim or annual period for which financial statements have not yet been issued and apply it either (1) in the period of adoption or (2) retrospectively to each period in which the income tax effects of the Tax Act related to items in accumulated other comprehensive income or loss are recognized. When adopted, the ASU requires all entities to make new disclosures, regardless of whether they elect to reclassify stranded amounts. Companies are required to disclose whether or not they elected to reclassify the tax effects related to the Tax Act as well as their policy for releasing income tax effects from accumulated other comprehensive income or loss. The guidance is effective for annual reporting periods beginning after December 15, 2018, and interim periods within those annual reporting periods with early adoption permitted. On January 1, 2018, the Company elected to early adopt the ASU and applied the amendments in the period of adoption. As a result, the Company reclassified $1.1 million of “stranded” tax effects of the Tax Act from accumulated other comprehensive income (loss) to accumulated deficit in the accompanying consolidated balance sheet and the accompanying consolidated statements of changes in stockholders’ equity. See Note 13–Derivative Instruments and Hedging Activities for additional disclosure.

In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities. ASU 2017-12 aims to improve reporting of hedging relationships to better portray the economic results of an entity’s risk management activities in its financial statements and simplify the application of the hedge accounting guidance. This ASU is effective for fiscal years beginning after December 15, 2018 and interim periods within those annual reporting periods with early adoption permitted. For cash flow and net investment hedges existing as of the adoption date, the guidance requires a cumulative-effect adjustment as of the beginning of the fiscal year that an entity adopts the amendments; however, the presentation and disclosure guidance should be applied prospectively. The Company adopted ASU 2017-12 during the second quarter of 2018. The impact of the adoption was not material to the Company’s consolidated financial statements; as a result, no cumulative effect adjustment to beginning retained earnings was required. See Note 13–Derivative Instruments and Hedging Activities for additional disclosure.

In May 2017, the FASB issued ASU 2017-09, Compensation–Stock Compensation (Topic 718): Scope of Modification Accounting. This ASU was issued to provide clarity and reduce diversity in practice regarding the application of guidance on the modification of equity awards. The guidance is effective for annual reporting periods beginning after December 15, 2017, and interim periods within those annual reporting periods with early adoption permitted and should be applied prospectively to an award modified on or after the adoption date. The Company adopted this standard on January 1, 2018. The adoption of this ASU did not have a material impact on the Company’s consolidated financial statements as the Company historically has accounted for all modifications in accordance with Topic 718 and has not been subject to the exception described under this ASU.

In November 2016, the FASB issued ASU 2016-18, Restricted Cash–a Consensus of the FASB Emerging Issues Task Force. This ASU requires companies to include restricted cash balances with cash and cash equivalent balances in the statement of cash flows. The guidance is effective for annual reporting periods beginning after December 15, 2017, and interim periods within those annual reporting periods with early adoption permitted, and should be applied using a retrospective transition method. The Company adopted this standard on January 1, 2018 using the retrospective transition method. For the years ended December 31, 2017 and 2016, the adoption of ASU 2016-18 increased net cash used in investing activities by $0.4 million and decreased net cash used in investing activities by $0.2 million, respectively, when compared to the previously reported amounts in the accompanying consolidated statements of cash flows.

In October 2016, the FASB issued ASU 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory. ASU 2016-16 simplifies the income tax accounting of intra-entity transfers of an asset other than inventory by requiring an entity to recognize the income tax effect when the transfer occurs. The guidance is effective for annual reporting periods beginning after December 15, 2017, including interim reporting periods within those annual reporting periods and early adoption is permitted. The Company adopted this standard on January 1, 2018 using a modified retrospective transition method. The adoption of ASU 2016-16 did not have a material impact on the Company’s consolidated financial statements.

In August 2016, the FASB issued ASU 2016-15, Classification of Certain Cash Receipts and Cash Payments. This ASU provides guidance on the presentation and classification of eight specific cash flow issues that previously resulted in diversity in practice. The ASU is effective for annual periods beginning after December 15, 2017 and interim periods therein. The Company adopted this standard on January 1, 2018 using a retrospective transition method for each period presented. The adoption of ASU 2016-15 did not have a material impact on the Company’s consolidated statements of cash flows.

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606), which supersedes the revenue recognition requirements in Topic 605, Revenue Recognition. Under this ASU and subsequently issued amendments, revenue is recognized at the time a good or service is transferred to a customer for the amount of consideration expected to be received. Entities may use a full retrospective approach or report the cumulative effect as of the date of adoption. The Company adopted this standard and subsequently issued amendments on January 1, 2018, using the modified retrospective transition method. The adoption of ASU 2014-09 and its subsequently issued amendments did not have a material impact on the Company’s existing or new contracts as of January 1, 2018; therefore, no cumulative adjustment to beginning retained earnings was required as a result of adoption. See Note 2–Summary of Significant Accounting Policies subtopic “Revenue Recognition” and Note 4–Revenues for additional disclosure.

Recently Issued Accounting Standards

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). The new standard is intended to provide enhanced transparency and comparability by requiring lessees to record right-of-use assets and corresponding lease liabilities on the balance sheet. The new guidance will require the Company to continue to classify leases as either operating or financing, with classification affecting the pattern of expense recognition in the income statement. Accounting by lessors will remain largely unchanged from current GAAP. Lessees and lessors are also required to disclose qualitative and quantitative information about leasing arrangements to enable financial statement users to assess the amount, timing and uncertainty of cash flows arising from leases. In July 2018, the FASB issued ASU 2018-10, Codification Improvements to Topic 842, Leases, and ASU 2018-11, Leases (Topic 842) Targeted Improvements. ASU 2018-10 clarifies how to apply certain aspects of ASU 2016-02. ASU 2018-11 provides entities the option of recognizing the cumulative effect of applying the new standard as an adjustment to beginning retained earnings in the year of adoption while continuing to present all prior periods under previous lease accounting guidance. These ASUs will be effective for annual periods beginning after December 15, 2018, and interim periods therein with early adoption permitted. The Company adopted these ASU’s (collectively, “ASC 842”) on January 1, 2019 using the modified retrospective method. The new standard also provides a number of optional provisions, known as practical expedients, which companies may elect to adopt to facilitate implementation. Upon adoption, the Company elected the package of practical expedients which, among other items, precludes the Company from needing to reassess 1) whether any expired or existing contracts are or contain leases, 2) the lease classification of any expired or existing leases, and 3) initial direct costs for any existing leases. In preparation for the adoption of ASC 842, the Company is establishing new processes and internal controls and is also implementing a new lease accounting information system to enable the preparation of financial information to comply with the new lease accounting and disclosure requirements.

The Company is finalizing its analysis of the expected impacts that the adoption of ASC 842 will have on its consolidated financial statements. Based on preliminary estimates, the Company expects to record right-of-use assets and corresponding lease liabilities of approximately $130.0 million as of January 1, 2019 based on the present value of future minimum lease payments. The Company is currently analyzing other impacts the adoption of ASC 842 may have, however it does not expect a material impact on its consolidated statements of comprehensive income (loss), consolidated statements of cash flows or debt covenant calculations. For more information regarding the Company’s commitments under long-term operating leases requiring annual minimum lease payments, refer to Note 15–Commitments and Contingencies.

In July 2018, the FASB issued ASU 2018-09, Codification Improvements, which clarifies, corrects and makes minor improvements to a wide variety of topics in the ASC. The amendments make the ASC easier to understand and apply by eliminating inconsistencies and providing clarifications. The transition and effective dates are based on the facts and circumstances of each amendment, with some amendments becoming effective upon issuance of the ASU, and others becoming effective for annual periods beginning after December 15, 2018. Included in this ASU are amendments to ASC 718-740, Compensation - Stock Compensation - Income Taxes, which clarify that an entity should recognize excess tax benefits in the period in which the amount of deduction is determined. The Company is evaluating the effect of the amendments within ASU 2018-09, but does not expect a material impact on the Company's financial position or results of operations.

In August 2018, the FASB issued ASU 2018-15, Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract. This ASU generally aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. Capitalized implementation costs related to a hosting arrangement that is a service contract will be amortized over the term of the hosting arrangement, beginning when the module or component of the hosting arrangement is ready for its intended use. The ASU also adds certain disclosure requirements related to implementation costs incurred for internal-use software and cloud computing arrangements. ASU 2018-15 is effective for fiscal years beginning after December 15, 2019 and interim periods within those fiscal years, with early adoption permitted. The amendments in this ASU can be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. The Company is evaluating the effect of adopting this new accounting guidance, but does not expect adoption will have a material impact on the Company’s financial position or results of operations.

In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820). The ASU eliminates certain disclosures related to the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy. The ASU also adds new disclosure requirements for Level 3 measurements. This ASU is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years, with early adoption permitted for any eliminated or modified disclosures. The Company is evaluating the effect of adopting this new accounting guidance, but does not expect adoption will have a material impact on the Company's disclosures.

In October 2018, the FASB issued ASU 2018-16, Derivatives and Hedging—Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate for Hedge Accounting Purposes, which expands the list of United States benchmark interest rates permitted in the application of hedge accounting. The amendments in this ASU allow use of the Overnight Index Swap (OIS) rate based on the Secured Overnight Financing Rate (SOFR) as a U.S. benchmark interest rate for hedge accounting purposes under Topic 815, Derivatives and Hedging. The amendments in this ASU are effective for annual periods beginning after December 15, 2018 and interim periods within those annual periods. The Company will adopt this guidance in the first quarter of 2019 using a prospective method. The Company does not expect adoption will have a material impact on the Company’s consolidated financial statements.