Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2015

Schedule of available-for-sale securities


	December 31, 2015								December 31, 2014
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized (Loss)		Estimated Fair Value		Amortized Cost		Gross Unrealized Gain		Gross Unrealized (Loss)		Estimated Fair Value
	(in thousands)
Money market deposits	$	5,966	$	—	$	—	$	5,966	$	—	$	—	$	—	$	—
U.S. Treasury securities		104,537		1		(725)		103,813		—		—		—		—
U.S. agency securities		79,491		—		(638)		78,853		—		—		—		—
Municipal securities		18,974		2		(56)		18,920
Total	$	208,968	$	3	$	(1,419)	$	207,552	$	—	$	—	$	—	$	—

Classified as:
Cash equivalents							$	5,966							$	—
Short-term investments								201,586								—
Total							$	207,552							$	—

Summarized portfolio of available-for-sale securities by contractual maturity


	December 31, 2015
	Amortized Cost		Fair Value
	(in thousands)
Less than one year	$	55,128	$	55,010
Greater than one year but less than five years		153,840		152,542
Total	$	208,968	$	207,552

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

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