Cash, Cash Equivalents and Investments (Tables)

12 Months Ended

Dec. 31, 2014

Cash and Cash Equivalents [Abstract]

Summary of Cash, Cash Equivalents and Investments

A summary of the cash equivalents and investments as of December 31, 2014 is as follows:

Cash Equivalents:	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value
Money market funds	$	17,865	$	—	$	—	$	17,865
Certificates of deposit	1,456		—		—		1,456
	$	19,321	$	—	$	—	$	19,321

Investments:	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
U.S. government agency bonds	$	7,508	$	—	$	(6	)	$	7,502
Corporate bonds and commercial paper	6,200		—		(8		)	6,192
Certificates of deposit	7,262		—		—			7,262
	$	20,970	$	—	$	(14	)	$	20,956

Investments Classified by Contractual Maturity Date

The following table summarizes the estimated fair value of the Company's investments, designated as available-for-sale and classified by the contractual maturity date of the investments as of the dates shown:

	December 31,
	2014		2013
Due within one year or less	$	9,095	$	—
Due after one year through five years	11,861		—
Total	$	20,956	$	—

Schedule of Fair Values and Gross Unrealized Losses for Available-for-sale Securities

The following table shows the fair values and the gross unrealized losses of these available-for-sale investments aggregated by investment category as of as of December 31, 2014:

	Fair Value		Gross Unrealized Loss
U.S. government agency bonds	$	7,508	$	(6	)
Corporate bonds and commercial paper	6,200		(8		)
Total	$	13,708	$	(14	)