Debt (Tables)

6 Months Ended

Jun. 30, 2015

Debt Disclosure [Abstract]

Schedule of Convertible Senior Notes

The fair values of the respective notes outstanding were measured based on quoted market prices.

	June 30, 2015			December 31, 2014
Principal amount of Convertible Senior Notes outstanding	$	172,500		$	172,500
Unamortized discount of liability component	(28,073		)	(30,403		)
Unamortized debt issuance costs (1)	(3,822		)	(4,139		)
Net carrying amount of liability component	140,605			137,958
Less: current portion	—			—
Long-term debt	$	140,605		$	137,958
Carrying value of equity component, net of issuance costs	$	29,758		$	29,758
Fair value of outstanding Convertible Senior Notes (2)	177,459			190,613
Remaining amortization period of discount on the liability component	5.5 years			6.0 years

(1) Includes reclassification of $0.6 million from Prepaid expenses and other current assets and $3.5 million from other non-current assets as of December 31, 2014.

(2) Subsequent to the issuance of the financial statements for the year ended December 31, 2014, the Company discovered an error in its disclosure of the fair value of outstanding convertible senior notes.  The fair value of the Convertible Senior Notes at December 31, 2014 was $190.6 million instead of the amount originally disclosed in the Company’s Annual Report on Form 10-K, which inappropriately reflected only the book value of the long-term debt component of the Convertible Senior Notes, which was $142.1 million. The revision in the disclosure of fair value for the Convertible Senior Notes did not impact net loss as previously reported or any prior amounts reported on the Consolidated Balance Sheets, Statements of Operations, Statements of Comprehensive (Loss) Income, Statements of Cash Flows or Statements of Stockholders' Equity as of December 31, 2014.