INVESTMENTS AND FAIR VALUE HIERARCHY	3 Months Ended
INVESTMENTS AND FAIR VALUE HIERARCHY	Mar. 31, 2022
Schedule of Investments [Abstract]
INVESTMENTS AND FAIR VALUE HIERARCHY	INVESTMENTS AND FAIR VALUE HIERARCHY The Company received debentures and warrants as sale consideration in connection with the sale of its Kandy Communications Business on December 1, 2020 to American Virtual Cloud Technologies, Inc. ("AVCT"). The debentures bore interest at a rate of 10% per annum (the "Debentures"), which was added to the principal amount of the Debentures. The Company recorded $1.5 million of interest income in the three months ended March 31, 2021, which was added to the principal amount of the Debentures, and which is included in Interest expense, net, in the condensed consolidated statement of operations. On September 8, 2021 (the "Debenture Conversion Date"), the debentures were converted into 13,700,421 shares of AVCT common stock (the "Debenture Shares"). The warrants entitle the Company to purchase 4,377,800 shares of AVCT common stock at an exercise price of $0.01 per share, and expire on December 1, 2025 (the "Warrants"). The Company had not exercised any of the Warrants as of March 31, 2022. The Company's investment in AVCT (the "AVCT Investment") is comprised of the debentures and Warrants for periods prior to the Debenture Conversion Date and the Debenture Shares and Warrants for periods subsequent to the Debenture Conversion Date. The Company is recording the AVCT Investment at fair value, with changes in fair value recorded as a component of Other expense, net, in the condensed consolidated statements of operations. The fair values of the AVCT Investment, which are reported as Investments in the Company's condensed consolidated balance sheets, were $16.9 million and $43.9 million at March 31, 2022 and December 31, 2021, respectively. The Company recorded a loss of $27.0 million in the three months ended March 31, 2022, representing the change in the fair value of the AVCT Investment. The Company recorded a loss of $23.9 million in the three months ended March 31, 2021 representing the change in the fair value of the AVCT Investment, which was partially offset by the paid-in-kind interest income described above. The AVCT Investment is classified as a Level 1 fair value measurement at both March 31, 2022 and December 31, 2021. The Company evaluated the nature of its investment in AVCT at March 31, 2022 and December 31, 2021, and determined that it represented an equity interest on a diluted basis of approximately 10% and 15%, respectively. The Company determined that it is not the primary beneficiary of AVCT as it does not have the power to direct the activities that most significantly impact the AVCT Investment's economic performance, and therefore concluded that it had neither significant influence nor a controlling interest arising from the AVCT Investment that would require consolidation as of March 31, 2022 or December 31, 2021. The carrying amounts of the Company's financial instruments approximate their fair values and include cash equivalents, accounts receivable, borrowings under a revolving credit facility, accounts payable and long-term debt. Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or a liability. The three-tier fair value hierarchy is based on the level of independent, objective evidence surrounding the inputs used to measure fair value. A financial instrument's categorization within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The fair value hierarchy is as follows: Level 1. Level 1 applies to assets or liabilities for which there are quoted prices in active markets for identical assets or liabilities. Level 2. Level 2 applies to assets or liabilities for which there are inputs that are directly or indirectly observable in the marketplace, such as quoted prices for similar assets or liabilities in active markets or quoted prices for identical assets or liabilities in markets with insufficient volume or infrequent transactions (less active markets). Level 3. Level 3 applies to assets or liabilities for which there are unobservable inputs to the valuation methodology that are significant to the measurement of the fair value of the assets or liabilities.