Fair Value of Financial Instruments - Summary of Investments and Cash Equivalents (Details) $ in Thousands	Dec. 31, 2016 USD ($) Investment	Dec. 31, 2015 USD ($)	Feb. 04, 2014 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Short-term investments	$ 24,385	$ 65,855
Number of investment in unrealized loss positions \| Investment	0
Convertible Debt \| Senior Convertible Notes due 2034
Schedule of Available-for-sale Securities [Line Items]
Interest rate on notes	2.75%		2.75%
Estimated fair value of notes	$ 139,700	$ 118,800
Principal amount of Notes	$ 201,300		$ 201,300

Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

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

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