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Debt - Convertible Notes (Details)				1 Months Ended	3 Months Ended			9 Months Ended
	Jul. 22, 2020 USD ($)	May 12, 2020 USD ($)	Jan. 09, 2017 USD ($)	Feb. 29, 2020 USD ($) $ / shares shares	Sep. 30, 2020 USD ($) $ / shares shares	Mar. 31, 2020 USD ($) shares	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) trading_day $ / shares	Sep. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	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						32,062,000	0
Loss on debt conversion and extinguishment					$ 1,180,000		$ 0	76,354,000	$ 0
2025 Notes
Debt Instrument [Line Items]
Loss on debt conversion and extinguishment					1,200,000
Debt conversion amount					$ 13,500,000
Conversion (shares) | shares					1,177,156
Shares in satisfaction of make-whole payment (shares) | shares					108,572
Value of converted amount					$ 13,500,000
2022 Notes
Debt Instrument [Line Items]
Loss on debt conversion and extinguishment		67,200,000
Convertible Debt | 2025 Notes
Debt Instrument [Line Items]
Proceeds from completed registered offering		100,000,000.0
Principal amount		180,400,000			$ 166,898,000			$ 166,898,000
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					4.03%			4.03%
Debt aggregate face amount		180,400,000
Convertible Debt | 2022 Notes
Debt Instrument [Line Items]
Principal amount		45,000,000.0			$ 0			$ 0		$ 2,000	$ 105,125,000
Estimated fair value of convertible debt		$ 112,400,000
Debt conversion amount	$ 2,000					$ 59,900,000
Conversion (shares) | shares						13,688,876
Effective interest rate					12.89%			12.89%
Debt aggregate face amount			$ 119,800,000
Convertible Debt | Privately negotiated exchange agreements
Debt Instrument [Line Items]
Loss on debt conversion and extinguishment						$ 7,900,000
Conversion (shares) | shares						942,706
Value of converted amount						$ 7,900,000
Convertible Debt | Novatel Wireless Notes
Debt Instrument [Line Items]
Debt conversion amount			$ 119,800,000	$ 250,000
Conversion (shares) | shares				50,000
Stated interest rate of debt issued												5.50%
Conversion price ($ per share) | $ / shares				$ 5.00
Debt aggregate face amount												$ 120,000,000.0

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