Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2013

Company's Available-for-sale Securities by Level within Fair Value Hierarchy

The Company’s available-for-sale securities by level within the fair value hierarchy were as follows:


As of December 31, 2013	Fair value measurement using:
As of December 31, 2013	Level 1		Level 2		Level 3		Total
	(In thousands)
Cash equivalents:
Money market fund	$	8,454	$	—	$	—	$	8,454
Short-term investments:
U.S. government-related debt securities		—		1,566		—		1,566
Corporate debt securities		—		31,149		—		31,149

Total	$	8,454	$	32,715	$	—	$	41,169


As of December 31, 2012	Fair value measurement using:
As of December 31, 2012	Level 1		Level 2		Level 3		Total
	(In thousands)
Cash equivalents:
Money market fund	$	20,510	$	—	$	—	$	20,510

Company's Preferred Stock Warrant Liabilities by Level within Fair Value Hierarchy

The Company’s preferred stock warrant liabilities by level within the fair value hierarchy were as follows:


As of December 31, 2012	Fair value measurement using:
As of December 31, 2012	Level 1		Level 2		Level 3		Total
	(In thousands)
Preferred stock warrant liability	$	—	$	—	$	3,532	$	3,532

- Definition

Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities.

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- Definition

Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable.

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