Cash and Investments

3 Months Ended

Mar. 31, 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 March 31, 2015 and December 31, 2014 (in thousands):

	March 31, 2015		December 31, 2014
Cash	$	1,497	$	2,763
Cash equivalents:
Money market funds		8,451		9,362
Corporate debt securities		—		1,002
Total cash equivalents		8,451		10,364
Total cash and cash equivalents		9,948		13,127
Short-term investments:
Corporate commercial paper		1,199		550
Corporate debt securities		15,447		12,713
Total short-term investments		16,646		13,263
Restricted cash—money market fund		250		250
Total cash, cash equivalents, investments and    restricted cash	$	26,844	$	26,640

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