SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	9 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	Sep. 30, 2020
Accounting Policies [Abstract]
Basis of Presentation	The accompanying unaudited consolidated financial statements have been prepared in accordance with U.S. Generally Accepted Accounting Principles (“GAAP”) and pursuant to the regulations of the U.S. Securities and Exchange Commission (“SEC”). The unaudited financial information reflects, in the opinion of management, all adjustments, consisting of normal recurring adjustments, considered necessary for a fair statement of the Company's financial position, results of operations and cash flows for the periods indicated. The results reported for the interim period presented are not necessarily indicative of results that may be expected for the full year. These consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in the Company's audited consolidated financial statements as of and for the year ended December 31, 2019 included in the Prospectus which constituted a part of the Company's Registration Statement on Form S-1 (File No. 333-239940), which was declared effective by the SEC on July 27, 2020 (the "Prospectus").
Consolidation	The consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. Intercompany accounts and transactions have been eliminated. Certain prior period balances have been reclassified to conform to the current period presentation in the consolidated financial statements and the accompanying notes.
Comprehensive Loss	Comprehensive loss includes all changes in equity during a period from non-owner sources. Through September 30, 2020, there are no components of comprehensive loss which are not included in net loss; therefore, a separate statement of comprehensive loss has not been presented. The Company does not have any foreign currency translation adjustments as a component of other comprehensive loss through September 30, 2020, as the functional currency of all subsidiaries is the U.S. Dollar.
Concentration of Credit Risk	Financial instruments that potentially subject the Company to concentrations of credit risk consist of cash, cash equivalents, and restricted cash and cash equivalents. The Company's cash is placed with high-credit-quality financial institutions and issuers, and at times exceed federally insured limits. The Company limits its concentration of risk in cash equivalents by diversifying its investments among a variety of industries and issuers. The Company has not experienced any credit loss relating to its cash equivalents.
Concentration of Supplier Risk	The Company is not currently in the commercial production stage and generally utilizes suppliers for outside development and engineering support.
Cash, Cash Equivalents and Restricted Cash and Cash Equivalents	The Company considers all highly liquid investments purchased with a remaining maturity of three months or less to be cash equivalents. Additionally, the Company considers investments in money market funds with a floating net asset value to be cash equivalents.
Investments	Variable Interest Entities The Company may enter into investments in entities that are considered variable interest entities ("VIE") under ASC 810. A VIE is an entity that has either insufficient equity to permit the entity to finance its activities without additional subordinated financial support or equity investors who lack the characteristics of a controlling financial interest. If the Company is a primary beneficiary of a VIE, it is required to consolidate the entity. To determine if the Company is the primary beneficiary of a VIE, the Company evaluates whether it has both the power to direct the activities that most significantly impact the VIE’s economic performance and the obligation to absorb losses or the right to receive benefits from the VIE that could potentially be significant to the Company. If the Company is not the primary beneficiary and an ownership interest is held in the entity, the interest is accounted for under the equity method of accounting. The Company continuously assesses whether it is the primary beneficiary of a VIE as changes to existing relationships or future transactions may result in changing conclusions. Equity Method Investments in which the Company can exercise significant influence, but do not control, are accounted for using the equity method and are presented on the consolidated balance sheets. The Company’s share of the net earnings or losses of the investee is presented within the consolidated statements of operations. The Company evaluates its equity method investments whenever events or changes in circumstance indicate that the carrying amounts of such investments may be impaired. If a decline in the value of an equity method investment is determined to be other than temporary, a loss is recorded in earnings in the current period. Distributions received from equity method investees are presented in the consolidated statements of cash flows based on the cumulative earnings approach, whereby distributions received from equity method investments are classified as cash flows from operations to the extent of equity earnings and then as cash flows from investing activities thereafter.
Recent Accounting Pronouncements	As an emerging growth company (“EGC”), the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”), allows the Company to delay adoption of new or revised accounting pronouncements applicable to public companies until such pronouncements are applicable to private companies. The Company elected to use this extended transition period under the JOBS Act until such time the Company is no longer considered to be an EGC. The adoption dates discussed below reflect this election. The Company expects to become a large accelerated filer on the last day of its fiscal year 2020 and will no longer qualify as an EGC and plans to revise the adoption dates accordingly in subsequent filings. In February 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2016-02, Leases (Topic 842), to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. In July 2018, ASU 2018-10, Codification Improvements to Topic 842, Leases, was issued to provide more detailed guidance and additional clarification for implementing ASU 2016-02. Furthermore, in July 2018, the FASB issued ASU 2018-11, Leases (Topic 842): Targeted Improvements, which provides an optional transition method in addition to the existing modified retrospective transition method by allowing a cumulative effect adjustment to the opening balance of retained earnings in the period of adoption. These new leasing standards are effective for the Company beginning January 1, 2021, with early adoption permitted. The Company expects to adopt utilizing the modified retrospective transition method without restating comparative periods. In addition, the Company expects to elect certain practical expedients, including the package of practical expedients to not reassess prior conclusions related to contracts containing leases, lease classification and initial direct costs. While the Company continues to assess the impact of this guidance, the Company expects the most significant effects will relate to the recognition of right of use assets and lease liabilities on the consolidated balance sheet, enhanced disclosures, and the derecognition of existing build-to-suit assets and liabilities for the Company's lease of its Phoenix headquarters. In June 2016, the FASB issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses of Financial Instruments, which, together with subsequent amendments, amends the requirement on the measurement and recognition of expected credit losses for financial assets held. ASU 2016-13 is effective for the Company beginning January 1, 2023, with early adoption permitted. The Company is currently in the process of evaluating the effects of this pronouncement on the Company’s financial statements and does not expect it to have a material impact on the consolidated financial statements. In December 2019, the FASB issued ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes, which is intended to simplify various aspects related to accounting for income taxes. ASU 2019-12 is effective for the Company beginning January 1, 2022, with early adoption permitted. The Company is currently in the process of evaluating the effects of this pronouncement on the Company’s financial statements and does not expect it to have a material impact on the consolidated financial statements. In January 2020, the FASB issued ASU No. 2020-01, Investments – Equity Securities (Topic 321), Investments - Equity Method and Joint Ventures (Topic 323), and Derivative and Hedging (Topic 815), which addresses accounting for the transition into and out of the equity method and provides clarification of the interaction of rules for equity securities, the equity method of accounting, and forward contracts and purchase options on certain types of securities. ASU 2020-01 is effective for the Company beginning January 1, 2022, with early adoption permitted. The Company is currently in the process of evaluating the effects of this pronouncement on the Company’s financial statements and does not expect it to have a material impact on the consolidated financial statements.