Cash and Investments

12 Months Ended

Dec. 31, 2014

Cash And Cash Equivalents [Abstract]

Cash and Investments

2. Cash and Investments

Cash, cash equivalents, short-term investments, and restricted cash consist of the following (in thousands):

	December 31,
	2014		2013
Cash	$	2,763	$	2,521
Cash equivalents—money market funds		9,362		8,989
Corporate debt securities		1,002		2,000
Total cash and cash equivalents		13,127		13,510
Short-term investments:
Corporate commercial paper		550		1,500
Foreign government bonds		—		1,001
Corporate debt securities		12,713		4,794
Total short-term investments		13,263		7,295
Restricted cash—money market fund		250		250
Total cash, cash equivalents, short-term investments and    restricted cash	$	26,640	$	21,055

Gross unrealized gains and losses on our cash equivalents and short-term investments were not material as of December 31, 2014 and December 31, 2013. Our restricted cash balance at December 31, 2014 and 2013 relates to a letter of credit securing the lease of our corporate headquarters.