Stockholders' Deficit - Common Stock Activity (Details) - Common Stock - shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Common stock outstanding, beginning of period (in shares)	140,268,725	139,060,180
Shares issued for acquisition of iPass (in shares)	1,864,584	0
Vesting of restricted and common stock awards (in shares)	72,917	1,217,015
Common stock outstanding, end of period (in shares)	142,206,226	140,277,195