Cash and Investments

6 Months Ended

Jun. 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 June 30, 2015 and December 31, 2014 (in thousands):

	June 30, 2015		December 31, 2014
Cash	$	2,042	$	2,763
Cash equivalents:
Money market funds		9,674		9,362
Corporate debt securities		250		1,002
Total cash equivalents		9,924		10,364
Total cash and cash equivalents		11,966		13,127
Short-term investments:
Corporate commercial paper		1,399		550
Corporate debt securities		16,065		12,713
Total short-term investments		17,464		13,263
Restricted cash—money market fund		250		250
Total cash, cash equivalents, short-term investments    and restricted cash	$	29,680	$	26,640

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