Recent Accounting Pronouncements	3 Months Ended
Mar. 31, 2018
Accounting Changes And Error Corrections [Abstract]
Recent Accounting Pronouncements	2. 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 $1,094 of “stranded” tax effects of the Tax Act from accumulated other comprehensive (loss) income to accumulated deficit in the accompanying unaudited condensed consolidated balance sheet and the accompanying unaudited condensed consolidated statements of changes in stockholders’ equity. 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 ASU 2017-17 did not have a material impact on the Company’s unaudited condensed 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. The adoption of ASU 2016-18 decreased net cash used in investing activities and increased cash, cash equivalents and restricted cash by $950 when compared to the previously reported amounts in the accompanying unaudited condensed consolidated statement of cash flows for the three months ended March 31, 2017. 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. The adoption of ASU 2016-16 did not have a material impact on the Company’s unaudited condensed 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 to each period presented. The adoption of ASU 2016-15 did not have a material impact on the Company’s unaudited condensed 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 1 “Description of the Business and Basis of Presentation” subtopic “Revenue Recognition” for additional disclosure. Recently Issued Accounting Standards 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 is currently assessing the impact of this ASU on its unaudited condensed consolidated financial statements and does not expect a material impact. However, the new ASU may impact the Company’s presentation and disclosures. On February 25, 2016, the FASB issued ASU 2016-02, Leases. This ASU establishes a new lease accounting model that, for many companies, eliminates the concept of operating leases and requires entities to record lease assets and lease liabilities on the balance sheet for certain types of leases. Under this ASU, an entity is required to recognize right-of-use assets and lease liabilities on its balance sheet and disclose key information about leasing arrangements. Lessees and lessors are 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. The ASU will be effective for annual periods beginning after December 15, 2018, and interim periods therein. Early adoption will be permitted for all entities. The provisions of the ASU are to be applied using a modified retrospective approach. The Company has not yet adopted this ASU and is currently evaluating the impact of this ASU on its unaudited condensed consolidated financial statements. Upon adoption of this ASU, the Company expects its San Diego land lease, among other operating leases, to be recorded as a right-of-use asset with a corresponding lease liability.

2. 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 $1,094 of “stranded” tax effects of the Tax Act from accumulated other comprehensive (loss) income to accumulated deficit in the accompanying unaudited condensed consolidated balance sheet and the accompanying unaudited condensed consolidated statements of changes in stockholders’ equity.

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 ASU 2017-17 did not have a material impact on the Company’s unaudited condensed 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. The adoption of ASU 2016-18 decreased net cash used in investing activities and increased cash, cash equivalents and restricted cash by $950 when compared to the previously reported amounts in the accompanying unaudited condensed consolidated statement of cash flows for the three months ended March 31, 2017.

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. The adoption of ASU 2016-16 did not have a material impact on the Company’s unaudited condensed 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 to each period presented. The adoption of ASU 2016-15 did not have a material impact on the Company’s unaudited condensed 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 1 “Description of the Business and Basis of Presentation” subtopic “Revenue Recognition” for additional disclosure.

Recently Issued Accounting Standards

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 is currently assessing the impact of this ASU on its unaudited condensed consolidated financial statements and does not expect a material impact. However, the new ASU may impact the Company’s presentation and disclosures.

On February 25, 2016, the FASB issued ASU 2016-02, Leases. This ASU establishes a new lease accounting model that, for many companies, eliminates the concept of operating leases and requires entities to record lease assets and lease liabilities on the balance sheet for certain types of leases. Under this ASU, an entity is required to recognize right-of-use assets and lease liabilities on its balance sheet and disclose key information about leasing arrangements. Lessees and lessors are 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. The ASU will be effective for annual periods beginning after December 15, 2018, and interim periods therein. Early adoption will be permitted for all entities. The provisions of the ASU are to be applied using a modified retrospective approach. The Company has not yet adopted this ASU and is currently evaluating the impact of this ASU on its unaudited condensed consolidated financial statements. Upon adoption of this ASU, the Company expects its San Diego land lease, among other operating leases, to be recorded as a right-of-use asset with a corresponding lease liability.