Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2015

Investments, Debt and Equity Securities [Abstract]

Summary of Investment in Cash Equivalents and Marketable Securities

Cash equivalents and marketable securities, consisted of the following (in thousands):

	December 31, 2015
	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
Cash equivalents:
Money market funds	$	79,717	$	—	$	—		$	79,717
Marketable securities:
Corporate bonds		10,042		—		(34	)		10,008
Commercial paper		2,499		1		—			2,500
U.S. treasury securities		7,489		—		(27	)		7,462
U.S. agency obligations		2,497		1		—			2,498
	$	102,244	$	2	$	(61	)	$	102,185
Due within one year								$	87,235
Due within two years									14,950
Total								$	102,185

Summary of Financial Assets Measured at Fair Value on a Recurring Basis

The following table presents information about our financial assets that are measured at fair value on a recurring basis and indicates the fair value hierarchy of the valuation techniques utilized to determine such fair value (in thousands):

	Level 1		Level 2		Level 3		Total
Assets at December 31, 2015:
Cash and cash equivalents:
Money market funds	$	79,717	$	—	$	—	$	79,717
Marketable securities:
Corporate bonds		—		10,008		—		10,008
Commerical paper		—		2,500		—		2,500
U.S. treasury securities		—		7,462		—		7,462
U.S. agency obligations		—		2,498		—		2,498
	$	79,717	$	22,468	$	—	$	102,185
Assets at December 31, 2014:
Cash and cash equivalents:
Money market funds	$	66,052	$	—	$	—	$	66,052
	$	66,052	$	—	$	—	$	66,052