Significant Accounting Policies and Recent Accounting Pronouncements	6 Months Ended
Jun. 30, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Significant Accounting Policies and Recent Accounting Pronouncements	2. Significant Accounting Policies and Recent Accounting Pronouncements Significant Accounting Policies Except for the adoption of the new accounting standard for leases mentioned below, no material changes have been made to the Company's significant accounting policies disclosed in Note 1, Summary of Significant Accounting Policies, in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018. Leases — The Company determines if an arrangement is a lease at inception. Operating leases are included in operating lease right-of-use (“ROU”) assets, operating lease liabilities, and long-term operating lease liabilities on the Company’s condensed consolidated balance sheets. Operating lease ROU assets and operating lease liabilities are recognized based on the present value of the future minimum lease payments over the lease term at commencement date. As most of the Company’s leases do not provide an implicit rate, the Company uses its incremental borrowing rate based on the information available at the lease commencement date in determining the present value of future payments. The operating lease ROU assets also include any lease payments made and exclude lease incentives and initial direct costs incurred. The Company’s lease terms may include options to extend the lease when it is reasonably certain that the Company will exercise that option. Lease expense for minimum lease payments is recognized on a straight-line basis over the lease term. The Company has lease agreements with lease and non-lease components, which is accounted for as a single lease component. Adoption of New Accounting Standards In February 2016, the Financial Accounting Standards Board (“FASB”) amended the existing accounting standards for leases, Accounting Standards Update (“ASU”) 2016-02, Leases. The amendments require lessees to recognize, on the balance sheet, assets and liabilities for the rights and obligations created by leases. The accounting by lessors will remain largely unchanged from that applied under previous U.S. GAAP. The Company adopted the new standard in the first quarter of 2019, effective January 1, 2019, using the modified retrospective method, under which the new standard was applied prospectively rather than restating the prior periods presented. The Company elected the practical expedients under the transition guidance, which include the use of hindsight in determining the lease term and the practical expedient package to not reassess whether any expired or existing contracts are or contain leases, to not reassess the classification of any expired or existing leases, and to not reassess initial direct costs for any existing leases. In addition, the Company elected the practical expedient to recognize lease and non-lease components as a single lease component. The Company has elected not to record on the balance sheet leases with an initial term of twelve months or less. Upon adoption, the Company recognized both operating lease ROU assets and corresponding operating lease liabilities of approximately $5.8 million and $5.9 million, respectively, on its condensed consolidated balance sheet. There was no impact on the condensed consolidated statements of operations or the condensed consolidated statements of cash flows.

Significant Accounting Policies and Recent Accounting Pronouncements

6 Months Ended

Jun. 30, 2019

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Significant Accounting Policies and Recent Accounting Pronouncements

2. Significant Accounting Policies and Recent Accounting Pronouncements

Significant Accounting Policies

Except for the adoption of the new accounting standard for leases mentioned below, no material changes have been made to the Company's significant accounting policies disclosed in Note 1, Summary of Significant Accounting Policies, in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018.

Leases — The Company determines if an arrangement is a lease at inception. Operating leases are included in operating lease right-of-use (“ROU”) assets, operating lease liabilities, and long-term operating lease liabilities on the Company’s condensed consolidated balance sheets. Operating lease ROU assets and operating lease liabilities are recognized based on the present value of the future minimum lease payments over the lease term at commencement date. As most of the Company’s leases do not provide an implicit rate, the Company uses its incremental borrowing rate based on the information available at the lease commencement date in determining the present value of future payments. The operating lease ROU assets also include any lease payments made and exclude lease incentives and initial direct costs incurred. The Company’s lease terms may include options to extend the lease when it is reasonably certain that the Company will exercise that option. Lease expense for minimum lease payments is recognized on a straight-line basis over the lease term. The Company has lease agreements with lease and non-lease components, which is accounted for as a single lease component.

Adoption of New Accounting Standards

In February 2016, the Financial Accounting Standards Board (“FASB”) amended the existing accounting standards for leases, Accounting Standards Update (“ASU”) 2016-02, Leases. The amendments require lessees to recognize, on the balance sheet, assets and liabilities for the rights and obligations created by leases. The accounting by lessors will remain largely unchanged from that applied under previous U.S. GAAP.

The Company adopted the new standard in the first quarter of 2019, effective January 1, 2019, using the modified retrospective method, under which the new standard was applied prospectively rather than restating the prior periods presented. The Company elected the practical expedients under the transition guidance, which include the use of hindsight in determining the lease term and the practical expedient package to not reassess whether any expired or existing contracts are or contain leases, to not reassess the classification of any expired or existing leases, and to not reassess initial direct costs for any existing leases. In addition, the Company elected the practical expedient to recognize lease and non-lease components as a single lease component. The Company has elected not to record on the balance sheet leases with an initial term of twelve months or less. Upon adoption, the Company recognized both operating lease ROU assets and corresponding operating lease liabilities of approximately $5.8 million and $5.9 million, respectively, on its condensed consolidated balance sheet. There was no impact on the condensed consolidated statements of operations or the condensed consolidated statements of cash flows.