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Convertible Senior Notes - Balance of Convertible Note (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Nov. 15, 2018
Debt Instrument [Line Items]
Total Convertible Notes, net	$ 155,771	$ 148,981
Convertible Debt | Convertible Notes
Debt Instrument [Line Items]
Principal amount	210,000	210,000	$ 210,000
Unamortized discount	(49,907)	(56,156)
Unamortized issuance costs attributable to principal amount	(4,322)	(4,863)
Total Convertible Notes, net	$ 155,771	$ 148,981

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Face (par) amount of debt instrument at time of issuance.

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Amount, after accumulated amortization, of debt discount (premium).

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders.

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