Summary of Significant Accounting Policies - Impairment of Long-lived assets (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2020
Impairment of long-lived assets		$ 356,418
T1 satellite
Impairment of long-lived assets		48,120
D1 satellite
Impairment of long-lived assets		55,000
NBIoT capitalized costs
Impairment of long-lived assets	$ 253,000
NBIoT capitalized costs | Construction in progress
Impairment of long-lived assets		226,742
NBIoT capitalized costs | Operating lease assets
Impairment of long-lived assets		$ 26,556