Cash and Investments

9 Months Ended

Sep. 30, 2015

Cash And Cash Equivalents [Abstract]

Cash and Investments

2. Cash and Investments

Cash, cash equivalents, short-term investments, and restricted cash consisted of the following at September 30, 2015 and December 31, 2014 (in thousands):

	September 30, 2015		December 31, 2014
Cash	$	1,872	$	2,763
Cash equivalents:
Money market funds		10,192		9,362
Corporate commercial paper		1,000		—
Corporate debt securities		321		1,002
Total cash equivalents		11,513		10,364
Total cash and cash equivalents		13,385		13,127
Short-term investments:
Corporate commercial paper		2,496		550
Corporate debt securities		13,430		12,713
Total short-term investments		15,926		13,263
Restricted cash—money market fund		250		250
Total cash, cash equivalents, short-term investments    and restricted cash	$	29,561	$	26,640

Gross unrealized gains and losses on our short-term investments were not material as of September 30, 2015 and December 31, 2014. The restricted cash relates to a letter of credit securing the lease of our corporate headquarters.