Summary of Significant Accounting Policies (Policies)	9 Months Ended
Sep. 30, 2019
Accounting Policies [Abstract]
Unaudited Interim Financial Statements	Unaudited Interim Financial Statements The accompanying condensed consolidated financial statements are unaudited and have been prepared by the Company in accordance with accounting principles generally accepted in the United States (U.S. GAAP) and pursuant to the rules and regulations of the Securities and Exchange Commission. The year-end condensed consolidated balance sheet data was derived from the Company’s audited financial statements but does not include all disclosures required by U.S. GAAP. These condensed consolidated financial statements should be read in conjunction with the Company’s audited financial statements for the years ended December 31, 2018 and 2017 included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018, filed with the Securities and Exchange Commission on March 26, 2019 (the Annual Report). The condensed consolidated financial statements, in the opinion of management, reflect all normal and recurring adjustments necessary for a fair statement of the Company’s financial position and results of operations.
Equity Method Investments	Equity Method Investments The Company accounts for investments for which it does not have a controlling interest in accordance with Accounting Standards Codification (ASC) 323, Investments – Equity Method and Joint Ventures. The Company recognizes its pro-rata share of income and losses in the investment in “Loss from equity method investment” on the consolidated statement of operations and comprehensive loss, with a corresponding change to the investment in equity method investment on the consolidated balance sheet. After recording of losses in the current period, the investment has been reduced to $0.
Recently Adopted Accounting Pronouncements	Recently Adopted Accounting Pronouncements In February 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2016-02, Leases. ASU 2016-02 requires lessees to present right-of-use assets and lease liabilities on the balance sheet for all leases with terms longer than 12 months. The guidance is effective for years beginning after December 15, 2018 and is to be applied using a modified retrospective approach applied at the beginning of the earliest comparative period in the financial statements or in the year of adoption with a cumulative effect to the opening balance of retained earnings. The Company adopted the new guidance as of January 1, 2019 using the modified retrospective adoption method in which it did not restate prior periods. The Company elected the practical expedient to include both lease and non-lease components as a single component and account for it as a lease. In adopting the standard, the Company also elected to utilize several other practical expedients, including not reassessing contracts for classification as a lease, not having to reassess the lease classification of existing leases, and not reassessing the initial direct costs of existing leases. The adoption of this standard resulted in the recognition of right-of-use assets and related lease liabilities of approximately $2.4 million related to its operating lease commitments on the Condensed Consolidated Balance Sheet as of January 1, 2019. In June 2018, the FASB issued ASU No. 2018-07, Improvements in Nonemployee Share-Based Payment Accounting. ASU 2018-07 aligns the accounting for share-based payment awards to nonemployees with the accounting for share-based awards to employees. ASU 2018-07 is effective for interim and annual reporting periods beginning after December 15, 2018 and early adoption is permitted. The Company adopted ASU 2018-07 in the first quarter of 2019. The adoption of the standard was immaterial to the accompanying condensed consolidated financial statements. During the three months ended September 30, 2019, there were no other changes to the Company’s significant accounting policies as described in Note 2 to the financial statements included in the Company’s condensed consolidated financial statements as of December 31, 2018 and 2017 and for the years then ended included in the Annual Report.

Disclosure of accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example, common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting. The accounting policy may also address the accounting treatment for intercompany accounts and transactions, noncontrolling interest, and the income statement treatment in consolidation for issuances of stock by a subsidiary.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.3A-02)
-URI http://asc.fasb.org/extlink&oid=116822174&loc=d3e355033-122828

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.3A-03)
-URI http://asc.fasb.org/extlink&oid=116822174&loc=d3e355100-122828

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=109239629&loc=d3e5614-111684

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