Cash, Cash Equivalents, and Short-Term Investments (Tables)

3 Months Ended

Mar. 31, 2014

Cash And Cash Equivalents [Abstract]

Summary of Cash, Cash Equivalents and Short-Term Investments

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

	As of March 31, 2014
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Cash and cash equivalents:
Cash	$	32,595	$	—	$	—	$	32,595
Commercial paper		20,600		—		1		20,599
Bank deposits		10,180		—		—		10,180
Money market funds		7,373		—		—		7,373
Total	$	70,748	$	—	$	1	$	70,747
Short-term investments:
Commercial paper	$	1,004	$	1	$	—	$	1,005
Corporate debt obligations		23,908		21		11		23,918
Bank deposits		10,244		—		—		10,244
Total	$	35,156	$	22	$	11	$	35,167

	As of December 31, 2013
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Cash and cash equivalents:
Cash	$	41,973	$	—	$	—	$	41,973
Bank deposits		10,165		—		—		10,165
Commercial paper		21,948		—		1		21,947
Money market funds		2,619		—		—		2,619
Total	$	76,705	$	—	$	1	$	76,704
Short-term investments:
Corporate debt obligations	$	28,220	$	22	$	14	$	28,228
Bank deposits		10,153		—		—		10,153
Total	$	38,373	$	22	$	14	$	38,381

Summary of Cost and Estimated Fair Value of Short-Term Investments

The following table summarizes the cost and estimated fair value of short-term investments based on stated effective maturities as of March 31, 2014 (in thousands):

	As of March 31, 2014
	Amortized Cost		Estimated Fair Value
Short-term investments:
Due within one year	$	24,442	$	24,459
Due within two years		10,714		10,708
Total	$	35,156	$	35,167