Cash and Investments

12 Months Ended

Dec. 31, 2016

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,
	2016		2015
Cash	$	11,016	$	7,270
Cash equivalents—money market funds		2,796		1,500
Corporate commercial paper		500		5,404
Corporate debt securities		—		2,269
Total cash and cash equivalents		14,312		16,443
Short-term investments:
Corporate commercial paper		11,465		6,245
Treasury bonds		—		1,007
Corporate debt securities		7,423		6,028
Total short-term investments		18,888		13,280
Restricted cash equivalents		—		250
Total cash, cash equivalents, short-term investments and    restricted cash equivalents	$	33,200	$	29,973

Gross unrealized gains and losses on our cash equivalents and short-term investments were not material as of December 31, 2016 and December 31, 2015. Our restricted cash equivalents balance at December 31, 2015 related to a letter of credit securing the lease of our corporate headquarters. The restricted cash equivalents balance was released in September 2016 when we entered into a new letter of credit agreement secured by our credit agreement with JPMorgan Chase Bank, N.A.