Unaudited Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenue:
Total revenue	$ 82,375	$ 54,632	$ 156,244	$ 125,559
Operating expenses:
Cost of service revenue	15,177	10,167	29,272	21,174
Cost of equipment revenue	10,932	6,982	19,214	15,493
Engineering, design and development	6,541	5,498	12,034	12,855
Sales and marketing	4,826	2,516	8,555	6,966
General and administrative	11,746	9,133	22,119	23,839
Depreciation and amortization	3,547	3,218	7,664	6,797
Total operating expenses	52,769	37,514	98,858	87,124
Operating income	29,606	17,118	57,386	38,435
Other (income) expense:
Interest income	(54)	(75)	(111)	(653)
Interest expense	16,340	31,253	45,634	62,396
Loss on extinguishment of debt and settlement of convertible notes	79,564		83,961
Other (income) expense	(127)	1	(132)
Total other expense	95,723	31,179	129,352	61,743
Loss from continuing operations before income taxes	(66,117)	(14,061)	(71,966)	(23,308)
Income tax provision	277	140	312	281
Net loss from continuing operations	(66,394)	(14,201)	(72,278)	(23,589)
Net loss from discontinued operations, net of tax	(2,854)	(71,778)	(4,655)	(147,168)
Net loss	$ (69,248)	$ (85,979)	$ (76,933)	$ (170,757)
Net loss attributable to common stock per share – basic and diluted:
Net loss from continuing operations	$ (0.61)	$ (0.17)	$ (0.74)	$ (0.29)
Net loss from discontinued operations	(0.02)	(0.88)	(0.05)	(1.81)
Net loss	$ (0.63)	$ (1.05)	$ (0.79)	$ (2.10)
Weighted average number of shares—basic and diluted	109,060	81,757	96,884	81,482
Service [Member]
Revenue:
Total revenue	$ 64,767	$ 44,033	$ 124,122	$ 101,759
Product [Member]
Revenue:
Total revenue	$ 17,608	$ 10,599	$ 32,122	$ 23,800