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Organization and Business Operations (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 4 Months Ended | 5 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 31, 2021 | Oct. 19, 2020 | Jun. 30, 2021 | Sep. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2021 | Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Organization and Business Operations (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Net tangible assets |  |  |  |  | $ 678 |  |  | $ 678 |  |
Purchase price per share (in Dollars per share) |  |  |  |  |  |  |  |  | $ 3 | $ 3
Due fee amount |  |  |  |  |  |  |  |  | $ 2,400,000 |
Total revenue |  |  |  |  |  |  |  |  | 0.93 |
Capitalized development cost |  |  |  |  |  |  |  | $ 700,000 |  |
Useful life |  |  |  |  |  |  |  | 3 years |  |
Amortization |  |  |  |  |  |  |  | $ 63,000 |  |
Revenues expected to be recognized |  |  |  |  |  |  |  | 303,000 |  |
Area location transmitters (in Shares) |  |  |  |  |  | 900 |  |  |  |
Non cancellable contracts |  |  |  |  |  | $ 100,000 |  |  |  |
Cash |  |  | $ 7,739,000 |  | 8,669,000 | 7,739,000 |  | $ 8,669,000 | $ 14,481,000 |
Customer three [Member] |  |  |  |  |  |  |  |  |  |
Organization and Business Operations (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Customers |  |  |  |  |  |  |  | three customers |  |
Total revenue |  |  |  |  |  |  |  | $ 0.18 |  |
Customer One [Member] |  |  |  |  |  |  |  |  |  |
Organization and Business Operations (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Customers |  |  |  |  |  |  |  |  | one customer |
Total revenue |  |  |  |  |  |  |  | 0.53 |  |
Customer Two [Member] |  |  |  |  |  |  |  |  |  |
Organization and Business Operations (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Customers |  |  |  |  |  |  |  |  | two customer |
Total revenue |  |  |  |  |  |  |  | $ 0.27 |  |
Spartacus Acquisition Shelf Corp. [Member] |  |  |  |  |  |  |  |  |  |
Organization and Business Operations (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Authority to share issued (in Shares) | 100 |  |  | 100 |  |  |  |  |  |
Common units par value (in Dollars per share) | $ 0.0001 |  |  | $ 0.0001 |  |  | $ 0.0001 |  |  |
Net tangible assets |  |  |  | $ 5,000,001 |  |  | $ 5,000,001 |  |  |
Proceeds of PIPE investment |  |  |  | $ 250,000,000 |  |  |  |  |  |
Registration rights agreement description |  |  |  |  |  |  | The Registration Rights Agreement will also prohibit the transfer (subject to limited exceptions) of the shares of the Company’s common stock (a) received as equity consideration by certain stockholders of the SPAC for a period of one year following the Closing, subject to early termination in the event that the closing sale price of the Company’s common stock equals or exceeds $12.00 per share for 20 out of 30 consecutive trading days commencing at least 150 days after the Closing and (b) received as equity consideration by certain former owners of Holdings for a period of 180 days following the Closing, subject to early termination for 50% of the shares held thereby in the event that the closing sale price of the Company’s common stock equals or exceeds $12.00 per share for 20 out of 30 consecutive trading days commencing at least 60 days after the Closing. The Registration Rights Agreement will also prohibit the transfer (subject to limited exceptions) of the Company’s warrants held by Sponsor and B. Riley and shares issuable upon the exercise or conversion thereof for a period of 30 days following the Closing. |  |  |
Purchase price per share (in Dollars per share) |  |  |  | $ 10 |  |  | $ 10 |  |  |
Due fees |  |  |  | $ 5,900,000 |  |  |  |  |  |
Spartacus Acquisition Shelf Corp. [Member] | PIPE Investment [Member] |  |  |  |  |  |  |  |  |  |
Organization and Business Operations (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Gross proceeds |  |  |  | $ 205,000,000 |  |  |  |  |  |
Spartacus Acquisition Corp [Member] |  |  |  |  |  |  |  |  |  |
Organization and Business Operations (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds of PIPE investment |  |  | $ (70,000) |  | (516,309) | $ (70,000) |  |  |  |
Gross proceeds |  | $ 200,000,000 |  |  | $ 200,000,000 |  |  |  |  |
Description of warrant |  | Each Unit consists of one share of Class A common stock (“public share(s)”), and one-half of one redeemable warrant. Each whole warrant entitles the holder thereof to purchase one share of Class A common stock, par value $0.0001 per share (“Class A common stock”), at a price of $11.50 per share, subject to adjustment as described in the IPO. Only whole warrants are exercisable. |  |  |  |  |  |  |  |
Offering costs |  | $ 604,606 |  |  |  |  |  |  |  |
Warrant outstanding amount |  | 10,911,703 |  |  |  |  |  |  |  |
Minimum percentage of trust account required for business combination |  |  |  |  | 80.00% | 80.00% |  |  |  |
Percentage of outstanding voting securities |  |  | 50.00% |  | 50.00% | 50.00% |  | 50.00% |  |
Description of business acquisition |  |  |  |  | the closing of the IPO on October 19, 2020, an amount equal to at least $10.15 per Unit sold in the IPO was held in a trust account (“Trust Account”), to be invested only in U.S. government securities, with a maturity of 180 days or less or in money market funds meeting certain conditions under Rule 2a-7 under the Investment Company Act, which invest only in direct U.S. government treasury obligations. Except with respect to interest earned on the funds held in the Trust Account that may be released to the Company to pay its tax obligations, the proceeds from this offering will not be released from the Trust Account until the earliest to occur of: (a) the completion of the Company’s initial Business Combination, (b) the redemption of any public shares properly submitted in connection with a stockholder vote to amend the Company’s amended and restated memorandum and articles of association to (i) modify the substance or timing of the Company’s obligation to provide for the redemption of its public stocks in connection with an initial Business Combination or to redeem 100% of its public stocks if the Company do not complete its initial Business Combination within 18 months from the closing of this offering or (ii) with respect to any other material provisions relating to stockholders’ rights or pre-initial Business Combination activity, and (c) the redemption of the Company’s public shares if the Company are unable to complete its initial Business Combination within 18 months from the closing of this offering, subject to applicable law.The Company will provide its public stockholders with the opportunity to redeem all or a portion of their public shares upon the completion of the initial Business Combination either (i) in connection with a stockholder meeting called to approve the initial Business Combination or (ii) by means of a tender offer. The decision as to whether the Company will seek stockholder approval of a proposed initial Business Combination or conduct a tender offer will be made by the Company, solely in its discretion. The stockholders will be entitled to redeem their shares for a pro rata portion of the amount then on deposit in the Trust Account (initially approximately $10.15 per share, plus any pro rata interest earned on the funds held in the Trust Account and not previously released to the Company to pay its tax obligations). | the closing of the IPO on October 19, 2020, an amount equal to at least $10.15 per Unit sold in the IPO was held in a trust account (“Trust Account”), to be invested only in U.S. government securities, with a maturity of 180 days or less or in money market funds meeting certain conditions under Rule 2a-7 under the Investment Company Act, which invest only in direct U.S. government treasury obligations. Except with respect to interest earned on the funds held in the Trust Account that may be released to the Company to pay its tax obligations, the proceeds from the IPO will not be released from the Trust Account until the earliest to occur of: (a) the completion of the Company’s initial Business Combination, (b) the redemption of any public shares properly submitted in connection with a stockholder vote to amend the Company’s amended and restated certificate of incorporation (the “Amended and Restated Certificate of Incorporation”) to (i) modify the substance or timing of the Company’s obligation to provide for the redemption of its public shares in connection with an initial Business Combination or to redeem 100% of its public shares if the Company does not complete its initial Business Combination within 18 months from the closing of the offering or (ii) with respect to any other material provisions relating to stockholders’ rights or pre-initial Business Combination activity, and (c) the redemption of the Company’s public shares if the Company are unable to complete its initial Business Combination within 18 months from the closing of the IPO, subject to applicable law.The Company will provide its public stockholders with the opportunity to redeem all or a portion of their public shares upon the completion of the initial Business Combination either (i) in connection with a stockholder meeting called to approve the initial Business Combination or (ii) by means of a tender offer. The decision as to whether the Company will seek stockholder approval of a proposed initial Business Combination or conduct a tender offer will be made by the Company, solely in its discretion. The stockholders will be entitled to redeem their shares for a pro rata portion of the amount then on deposit in the Trust Account (initially approximately $10.15 per share, plus any pro rata interest earned on the funds held in the Trust Account and not previously released to the Company to pay its tax obligations). |  |  |  |
Net tangible assets |  |  | $ 5,000,001 |  | $ 5,000,001 | $ 5,000,001 |  | $ 5,000,001 |  |
Possible dissolution expenses |  |  |  |  | $ 100,000 | $ 100,000 |  |  |  |
Consummation of transactions, description |  |  |  |  |  | Consummation of the Transactions is subject to customary conditions of the respective parties, including, among others, that (i) there being no law or injunction prohibiting consummation of the Transactions; (ii) the Transactions be approved by the Company’s stockholders; (iii) all applicable waiting periods and any extensions thereof under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, and the rules and regulations promulgated thereunder will have expired or been terminated; (iv) the Registration Statement on Form S-4 of Shelf containing the proxy statement/prospectus for the Company’s special meeting of stockholders will have become effective; (v) receipt of consent to the Transactions from the Federal Communications Commission; (vi) the Company will have at least $5,000,001 of net tangible assets (as determined in accordance with Rule 3a51-1(g)(1) of the Exchange Act immediately following the closing of the Transaction (the “Closing”) (after giving effect to the redemption of any public shares by the Company’s public stockholders); and (vii) the Shelf common stock shares and warrants to be issued in connection with the Transactions shall have been approved for listing on The Nasdaq Stock Market LLC (“Nasdaq”). |  |  |  |
Proceeds of the PIPE Investment |  |  |  |  |  | $ 250,000,000 |  |  |  |
Registration rights agreement, description |  |  |  |  |  | (a) received as equity consideration by certain stockholders of the Company for a period of one year following the Closing, subject to early termination in the event that the closing sale price of Shelf’s common stock equals or exceeds $12.00 per share for 20 out of 30 consecutive trading days commencing at least 150 days after the Closing and (b) received as equity consideration by certain former owners of Holdings for a period of 180 days following the Closing, subject to early termination for 50% of the shares held thereby in the event that the closing sale price of Shelf’s common stock equals or exceeds $12.00 per share for 20 out of 30 consecutive trading days commencing at least 60 days after the Closing. The Registration Rights Agreement will also prohibit the transfer (subject to limited exceptions) of the Company’s warrants held by Sponsor and B. Riley and shares issuable upon the exercise or conversion thereof for a period of 30 days following the Closing. |  |  |  |
Purchase price per share (in Shares) |  |  |  |  |  | 10 |  |  |  |
Aggregate gross proceeds |  |  |  |  |  | $ 205,000,000 |  |  |  |
Due fee amount |  |  | 5,900,000 |  |  | 5,900,000 |  |  |  |
Operating bank account |  |  |  |  |  | 141,508 |  |  |  |
Working capital |  |  | (1,298,895) |  |  | (1,298,895) |  |  |  |
Aggregate of shares percentage |  |  |  |  | 15.00% |  |  |  |  |
Cash |  |  | $ 141,508 |  | $ 1,007,130 | $ 141,508 |  | $ 1,007,130 |  |
NextNav [Member] |  |  |  |  |  |  |  |  |  |
Organization and Business Operations (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Authorized units (in Shares) |  |  |  |  |  | 300,050,000 |  |  |  |
IPO [Member] |  |  |  |  |  |  |  |  |  |
Organization and Business Operations (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Underwriting discount |  | $ 4,000,000 |  |  |  |  |  |  |  |
IPO [Member] | Spartacus Acquisition Corp [Member] |  |  |  |  |  |  |  |  |  |
Organization and Business Operations (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Number of units (in Shares) |  | 20,000,000 |  |  |  |  |  |  |  |
Per unit price (in Dollars per share) |  | $ 10 |  |  |  |  |  |  |  |
Gross proceeds |  | $ 200,000,000 |  |  |  |  |  |  |  |
Transaction costs |  | 11,516,309 |  |  |  |  |  |  |  |
Underwriting discount |  | 4,000,000 |  |  |  |  |  |  |  |
Deferred underwriters discount |  | 7,000,000 |  |  |  |  |  |  |  |
Other offering costs |  | $ 516,309 |  |  |  |  |  |  |  |
Private Placement Warrants [Member] | Spartacus Acquisition Corp [Member] |  |  |  |  |  |  |  |  |  |
Organization and Business Operations (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase price per share (in Dollars per share) |  | $ 9.46 | $ 10.05 |  | $ 10.06 | $ 10.05 |  | $ 10.06 |  |
Number of units (in Shares) |  | 8,750,000 |  |  |  |  |  |  |  |
Per unit price (in Dollars per share) |  | $ 1 |  |  |  |  |  |  |  |
Gross proceeds |  | $ 8,750,000 |  |  |  |  |  |  |  |
Aggregate gross proceeds |  | $ 8,750,000 |  |  |  | $ 8,750,000 |  |  |  |
Class A Common Stock [Member] | Spartacus Acquisition Shelf Corp. [Member] | PIPE Shares [Member] |  |  |  |  |  |  |  |  |  |
Organization and Business Operations (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Purchase of shares (in Shares) |  |  |  | 20,500,000 |  |  |  |  |  |
Class A Common Stock [Member] | Spartacus Acquisition Corp [Member] |  |  |  |  |  |  |  |  |  |
Organization and Business Operations (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Common units par value (in Dollars per share) |  |  | $ 0.0001 |  | $ 0.0001 | $ 0.0001 |  | $ 0.0001 |  |
PIPE Investors |  |  |  |  |  | $ 20,500,000 |  |  |  |
Price per share (in Dollars per share) |  | $ 11.5 |  |  |  |  |  |  |  |
Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |
Organization and Business Operations (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Authorized units (in Shares) |  |  |  |  |  | 107,950,000 |  |  |  |
Class C Redeemable Preferred Units [Member] |  |  |  |  |  |  |  |  |  |
Organization and Business Operations (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Authorized units (in Shares) |  |  |  |  |  | 13,400,000 |  |  |  |
Class D Redeemable Preferred Units [Member] |  |  |  |  |  |  |  |  |  |
Organization and Business Operations (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Authorized units (in Shares) |  |  |  |  |  | 94,550,000 |  |  |  |
Class A-1 Common Units [Member] |  |  |  |  |  |  |  |  |  |
Organization and Business Operations (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Authorized units (in Shares) |  |  |  |  |  | 128,508,093 |  |  |  |
Class B-1 Common Units [Member] |  |  |  |  |  |  |  |  |  |
Organization and Business Operations (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Authorized units (in Shares) |  |  |  |  |  | 5,199,202 |  |  |  |
Class B-2 Common Units [Member] |  |  |  |  |  |  |  |  |  |
Organization and Business Operations (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Authorized units (in Shares) |  |  |  |  |  | 250,000 |  |  |  |
Class B-3 Common Units [Member] |  |  |  |  |  |  |  |  |  |
Organization and Business Operations (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Authorized units (in Shares) |  |  |  |  |  | 250,000 |  |  |  |
Class B-4 Common Units [Member] |  |  |  |  |  |  |  |  |  |
Organization and Business Operations (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Authorized units (in Shares) |  |  |  |  |  | 4,500,000 |  |  |  |
Sponsor [Member] | Spartacus Acquisition Corp [Member] |  |  |  |  |  |  |  |  |  |
Organization and Business Operations (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Initial business combination redeem percentage |  |  | 100.00% |  | 100.00% | 100.00% |  | 100.00% |  |
Common Units [Member] |  |  |  |  |  |  |  |  |  |
Organization and Business Operations (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Common units par value (in Dollars per share) |  |  | $ 0.0001 |  |  | $ 0.0001 |  |  |  |
Authorized units (in Shares) |  |  |  |  |  | 192,100,000 |  |  |  |
Common Units [Member] | Board of Directors Chairman [Member] |  |  |  |  |  |  |  |  |  |
Organization and Business Operations (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Authorized units (in Shares) |  |  |  |  |  | (53,392,705) |  |  |  |
Common Units [Member] | Class A Common Stock [Member] | Spartacus Acquisition Corp [Member] |  |  |  |  |  |  |  |  |  |
Organization and Business Operations (Details) [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds of PIPE investment |  |  |  |  |  |  |  |  |  |
Number of units (in Shares) |  |  |  |  | 20,000,000 |  |  |  |  |
Gross proceeds |  |  |  |  | $ 2,000 |  |  |  |  |

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