Available-for-Sale Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2015

Investments, Debt and Equity Securities [Abstract]

Summary of Available-for-Sale Marketable Securities by Major Type of Security

The following table summarizes the Company’s available-for-sale marketable securities by major type of security as of December 31, 2015:


	Amortized Cost		Gross Unrealized					Estimated Fair Value
Type of Security	Amortized Cost		Gains		Losses			Estimated Fair Value
Money market mutual funds	$	42,017	$	—	$	(31	)	$	41,986
U.S. Treasury securities		2,528		—		—			2,528
Other U.S. government agency obligations		13,492		4		—			13,496
Corporate bonds		14,194		—		(6	)		14,188
Commercial paper		19,444		1		(3	)		19,442

Total available-for-sale marketable securities	$	91,675	$	5	$	(40	)	$	91,640

Schedule of Fair Values and Amortized Cost of Marketable Debt Securities by Contractual Maturity

The Company classifies its marketable debt securities based on their contractual maturity dates. The marketable debt securities as of December 31, 2015 mature at various dates through September 2016. The fair values and amortized cost of marketable debt securities by contractual maturity were as follows. The table does not include money market funds that are classified as available-for-sale marketable securities.


	As of December 31,
	2015				2014
Contractual maturity	Fair Value		Amortized Cost		Fair Value		Amortized Cost
Less than one year	$	49,653	$	49,657	$	—	$	—

Schedule of Fair Values and Continuous Unrealized Loss Positions of Available-for-Sale Marketable Securities

The following table shows the fair value of the Company’s available-for-sale marketable securities that have unrealized losses and that are deemed to be only temporarily impaired, aggregated by investment category and length of time that the individual investments have been in a continuous unrealized loss position.


	Less than 12 Months					12 Months or Greater				Total
As of December 31, 2015	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses
Money market mutual funds	$	30,985	$	(31	)	$	—	$	—	$	30,985	$	(31	)
Corporate bonds		14,187		(6	)		—		—		14,187		(6	)
Commercial paper		11,960		(3	)		—		—		11,960		(3	)

Total	$	57,132	$	(40	)	$	—	$	—	$	57,132	$	(40	)

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

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