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Long-Term Debt - Accretion of Debt Discount and Amortization of Financing Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Debt Instrument [Line Items]
Contractual coupon interest	$ 2,356	$ 1,185	$ 5,068	$ 3,555
Accretion of debt discount	4,092	3,124	10,928	9,252
Amortization of deferred financing costs	380	347	1,091	1,042
Total	6,828	4,656	17,087	13,849
Convertible Debt | Convertible Notes 2024
Debt Instrument [Line Items]
Contractual coupon interest	2,000	0	2,600	0
Accretion of debt discount	3,088	0	4,189	0
Amortization of deferred financing costs	276	0	374	0
Total	5,364	0	7,163	0
Convertible Debt | Convertible Notes 2020
Debt Instrument [Line Items]
Contractual coupon interest	356	1,185	2,468	3,555
Accretion of debt discount	1,004	3,124	6,739	9,252
Amortization of deferred financing costs	104	347	717	1,042
Total	$ 1,464	$ 4,656	$ 9,924	$ 13,849

X

- Definition

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of amortization expense attributable to debt issuance costs.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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