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Debt - Convertible Notes (Details)				1 Months Ended		3 Months Ended			6 Months Ended
	Jul. 22, 2020 USD ($)	May 12, 2020 USD ($)	Jan. 09, 2017 USD ($)	Aug. 10, 2020 USD ($) shares	Feb. 29, 2020 USD ($) $ / shares shares	Jun. 30, 2020 USD ($) $ / shares	Mar. 31, 2020 USD ($) shares	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) trading_day $ / shares	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Jun. 10, 2015 USD ($)
Debt Instrument [Line Items]
Proceeds from completed registered offering									$ 100,000,000	$ 0
Cash paid in exchange transaction		$ 32,000,000.0							32,062,000	0
Loss on debt conversion and extinguishment		67,200,000				$ 67,241,000		$ 0	75,174,000	$ 0
2025 Notes | Subsequent Event
Debt Instrument [Line Items]
Debt conversion amount				$ 13,500,000
Conversion (shares) | shares				1,200,000
Shares in satisfaction of make-whole payment (shares) | shares				100,000
Convertible Debt | 2025 Notes
Debt Instrument [Line Items]
Proceeds from completed registered offering		100,000,000.0
Principal amount		180,400,000				$ 180,375,000			$ 180,375,000
Debt issued in exchange transaction		80,400,000
Stated interest rate of debt issued						3.25%			3.25%
Principal amount per note						$ 1,000			$ 1,000
Conversion ratio									79.2896
Conversion price ($ per share) | $ / shares						$ 12.61			$ 12.61
Threshold percentage of stock price trigger									130.00%
Threshold of trading days | trading_day									20
Threshold of consecutive trading days | trading_day									30
Aggregate percentage of holders to declare notes due and payable in default event									25.00%
Percentage of principal and accrued interest that may be called in default event									100.00%
Percentage of principal and accrued interest that may be called in event of bankruptcy, insolvency or reorganization									100.00%
Stock price trigger (in dollars per share) | $ / shares									$ 10.51
Interest make-whole payment discount rate						1.00%			1.00%
Notes held by related parties						$ 80,400,000			$ 80,400,000
Effective interest rate						4.13%			4.13%
Convertible Debt | 2022 Notes
Debt Instrument [Line Items]
Principal amount		45,000,000.0				$ 2,000			$ 2,000		$ 105,125,000
Estimated fair value of convertible debt		112,400,000
Stated interest rate of debt issued						5.50%			5.50%
Effective interest rate						12.89%			12.89%
Debt aggregate face amount			$ 119,800,000
Debt conversion amount		$ 45,000,000.0					$ 59,900,000
Conversion (shares) | shares							13,688,876
Convertible Debt | 2022 Notes | Subsequent Event
Debt Instrument [Line Items]
Debt conversion amount	$ 2,000
Convertible Debt | Privately negotiated exchange agreements
Debt Instrument [Line Items]
Loss on debt conversion and extinguishment							$ 7,900,000
Value of converted amount							$ 7,900,000
Conversion (shares) | shares							942,706
Convertible Debt | Novatel Wireless Notes
Debt Instrument [Line Items]
Stated interest rate of debt issued												5.50%
Conversion price ($ per share) | $ / shares					$ 5.00
Debt aggregate face amount												$ 120,000,000.0
Debt conversion amount			$ 119,800,000		$ 250,000
Conversion (shares) | shares					50,000

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