Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2016

Schedule of available-for-sale securities


	March 31, 2016								December 31, 2015
	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	$	8,263	$	—	$	—	$	8,263	$	5,966	$	—	$	—	$	5,966
U.S. Treasury securities		102,950		183		(37)		103,096		104,537		1		(725)		103,813
U.S. agency securities		74,428		228		(40)		74,616		79,491		—		(638)		78,853
Municipal securities		18,824		68		(7)		18,885		18,974		2		(56)		18,920
Total	$	204,465	$	479	$	(84)	$	204,860	$	208,968	$	3	$	(1,419)	$	207,552

Classified as:
Cash equivalents							$	8,263							$	5,966
Short-term investments								196,597								201,586
Total							$	204,860							$	207,552

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


	March 31, 2016
	Amortized Cost		Fair Value
	(in thousands)
Less than one year	$	59,489	$	59,464
Greater than one year but less than five years		144,976		145,396
Total	$	204,465	$	204,860

- 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.

+ References + Details