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Debt - Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Long-term debt
Amortization of debt issuance costs			$ 256	$ 185
Convertible debt | 3.00% Convertible senior notes due 2022
Long-term debt
Contractual interest expense	$ 1,131	$ 1,131	2,241	2,241
Amortization of debt issuance costs	93	83	182	163
Amortization of debt discount	1,863	1,674	3,644	3,274
Total	$ 3,087	$ 2,888	$ 6,067	$ 5,678
Effective interest rate of the liability component	11.00%	11.00%	11.00%	11.00%

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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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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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

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