Marketable Securities

6 Months Ended

Jun. 30, 2013

Investments Debt And Equity Securities [Abstract]

Marketable Securities

4. Marketable Securities

Marketable securities at June 30, 2013 and December 31, 2012 consisted primarily of investments in U.S. Treasuries. Management determines the appropriate classification of the securities at the time they are acquired and evaluates the appropriateness of such classifications at each balance sheet date. The Company classifies its marketable securities as available-for-sale pursuant to ASC 320, Investments – Debt and Equity Securities. Marketable securities are recorded at fair value, with unrealized gains and losses included as a component of accumulated other comprehensive income (loss) in stockholders’ deficit and a component of total comprehensive loss in the consolidated statements of comprehensive loss, until realized. The fair value of these securities is based on quoted prices for identical or similar assets. Realized gains and losses are included in investment income on a specific-identification basis. There were no realized gains or losses on marketable securities for the three or six months ended June 30, 2013 or for the year ended December 31, 2012.

The Company reviews marketable securities for other-than-temporary impairment whenever the fair value of a marketable security is less than the amortized cost and evidence indicates that a marketable security’s carrying amount is not recoverable within a reasonable period of time. Other-than-temporary impairments of investments are recognized in the consolidated statements of operations if the Company has experienced a credit loss, has the intent to sell the marketable security, or if it is more likely than not that the Company will be required to sell the marketable security before recovery of the amortized cost basis. Evidence considered in this assessment includes reasons for the impairment, compliance with the Company’s investment policy, the severity and the duration of the impairment and changes in value subsequent to the end of the period.

Marketable securities at June 30, 2013 consist of the following (in thousands):

	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
Certificates of deposit	$	5,200	$	—	$	(5	)	$	5,195
U.S. Treasuries		16,598		1		—			16,599
	$	21,798	$	1	$	(5	)	$	21,794

Marketable securities at December 31, 2012 consist of the following (in thousands):

	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
Certificates of deposit	$	7,386	$	—	$	(2	)	$	7,384
U.S. Treasuries		29,294		1		—			29,295
	$	36,680	$	1	$	(2	)	$	36,679

All of the investments held at June 30, 2013 and December 31, 2012 had maturities of less than one year.

At June 30, 2013 and December 31, 2012, the Company held 22 and 30 debt securities that were in an unrealized loss position for less than one year, respectively. The aggregate fair value of debt securities in an unrealized loss position at June 30, 2013 and December 31, 2012 was $8.0 million and $13.7 million, respectively. There were no individual securities that were in a significant unrealized loss position as of June 30, 2013 and December 31, 2012. The Company evaluated its securities for other-than-temporary impairment and considered the decline in market value for the securities to be primarily attributable to current economic and market conditions. It is not more likely than not that the Company will be required to sell the securities, and the Company does not intend to do so prior to the recovery of the amortized cost basis. Based on this analysis, these marketable securities were not considered to be other-than-temporarily impaired as of June 30, 2013 and December 31, 2012.