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Convertible senior notes, 2015 Convertible Notes (Details 2) - USD ($) | Dec. 31, 2016 | Dec. 31, 2015 | Aug. 31, 2015
--- | --- | --- | ---
Long-term debt |  |  |
Less: Debt issuance costs | $ (2,500,000) |  |
Convertible debt | 3.00% Convertible senior notes due 2022 |  |  |
Long-term debt |  |  |
Principal | 150,000,000 | $ 150,000,000 | $ 150,000,000
Less: Debt issuance costs | (2,457,000) | (2,760,000) |
Less: Debt discount, net | (49,327,000) | (55,392,000) |
Net carrying amount | $ 98,216,000 | $ 91,848,000 |

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