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Fair Value of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2015

Fair Value Disclosures [Abstract]

Fair Value Measurements, Recurring and Nonrecurring

The following is a list of those assets and liabilities that are measured at fair value by hierarchy level:

	Fair Value Measurements Using
	Quoted Prices in Active Markets for Identical Assets (Level 1)				Significant Other Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)				Fair Value
As of September 30, 2015	(In Thousands)
U.S. Treasury securities and obligations of U.S. government agencies	$	41,404			$	26,819			$	—			$	68,223
Municipal debt securities	—				10,984				—				10,984
Corporate debt securities	—				177,343				—				177,343
Asset-backed securities	—				57,905				—				57,905
Cash and cash equivalents	132,791				—				—				132,791
Total assets	$	174,195			$	273,051			$	—			$	447,246
Warrant liability	$	—			$	—			$	1,899			$	1,899
Total liabilities	$	—			$	—			$	1,899			$	1,899

	Fair Value Measurements Using
	Quoted Prices in Active Markets for Identical Assets (Level 1)				Significant Other Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)				Fair Value
As of December 31, 2014	(In Thousands)
U.S. Treasury securities and obligations of U.S. government agencies	$	39,176			$	29,169			$	—			$	68,345
Municipal debt securities	—				11,963				—				11,963
Corporate debt securities	—				199,785				—				199,785
Asset-backed securities	—				56,408				—				56,408
Cash and cash equivalents	103,021				—				—				103,021
Total assets	$	142,197			$	297,325			$	—			$	439,522
Warrant liability	$	—			$	—			$	3,372			$	3,372
Total liabilities	$	—			$	—			$	3,372			$	3,372

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation

The following is a roll-forward of Level 3 liabilities measured at fair value:

	For the nine months ended September 30,
Warrant Liability	2015				2014
	(In Thousands)
Balance, January 1	$	3,372			$	6,371
Change in fair value of warrant liability included in earnings	(1,473		)		(3,009		)
Issuance of common stock on warrant exercise	—				(13		)
Gain on settlement of warrants	—				(37		)
Balance, September 30	$	1,899			$	3,312

X

- Definition

Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 820



-SubTopic 10



-Section 50



-Paragraph 3



-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19279-110258



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 820



-SubTopic 10



-Section 50



-Paragraph 2



-Subparagraph (a,b,bb)



-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258



Reference 3: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 820



-SubTopic 10



-Section 50



-Paragraph 2C



-URI http://asc.fasb.org/extlink&oid=36462937&loc=SL7498348-110258



Reference 4: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 820



-SubTopic 10



-Section 50



-Paragraph 1



-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258

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X

- Definition

Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 820



-SubTopic 10



-Section 50



-Paragraph 2



-Subparagraph (c)



-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 820



-SubTopic 10



-Section 50



-Paragraph 3



-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19279-110258

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