WARRANTS (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($)	Dec. 17, 2019 shares	Jul. 08, 2019 USD ($)	Jul. 01, 2019 USD ($)	Jun. 28, 2019 shares	Sep. 26, 2016 $ / shares shares
Class of Warrant or Right [Line Items]
Class of warrant or right, exercise price of warrants or rights (in dollars per share) | $ / shares								$ 4.76
Common stock, shares issued (in shares) | shares	102,959,000	98,204,000
Measurement Input, Risk Free Interest Rate
Class of Warrant or Right [Line Items]
Warrants and rights outstanding, measurement input (as a percent)					0.019
Measurement Input, Option Volatility
Class of Warrant or Right [Line Items]
Warrants and rights outstanding, measurement input (as a percent)					0.486
Measurement Input, Expected Term
Class of Warrant or Right [Line Items]
Warrants and rights outstanding, term					4 years 2 months 12 days
Measurement Input, Expected Dividend Rate
Class of Warrant or Right [Line Items]
Warrants and rights outstanding, measurement input (as a percent)					0
Comcast Milestones Achievement
Class of Warrant or Right [Line Items]
Class of warrant or right, outstanding (in shares) | shares							1,954,042
Comcast CableOS Software License Agreement
Class of Warrant or Right [Line Items]
Fair value of fully vested warrants | $					$ 16.1
Comcast Warrants Vested Prior to July 2019
Class of Warrant or Right [Line Items]
Fair value of fully vested warrants | $						$ 3.9
Comcast Warrants Vested July 2019
Class of Warrant or Right [Line Items]
Fair value of fully vested warrants | $						$ 20.0
Comcast Warrants Exercise in its Entirety
Class of Warrant or Right [Line Items]
Common stock, shares issued (in shares) | shares				3,217,547
Revenue from Contract with Customer Benchmark
Class of Warrant or Right [Line Items]
Reduction to revenues in connection with amortization of the warrant | $	$ 1.7	$ 1.7	$ 13.6
Maximum | Comcast Warrant Expires September 26, 2023
Class of Warrant or Right [Line Items]
Warrant grants to Comcast subject to vesting (in shares) | shares								7,816,162