Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2016

Schedule of available-for-sale securities


	September 30, 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	$	9,811	$	—	$	—	$	9,811	$	5,966	$	—	$	—	$	5,966
U.S. Treasury securities		75,455		131		(21)		75,565		104,537		1		(725)		103,813
U.S. agency securities		64,299		183		(13)		64,469		79,491		—		(638)		78,853
Municipal securities		17,629		61		(7)		17,683		18,974		2		(56)		18,920
Total	$	167,194	$	375	$	(41)	$	167,528	$	208,968	$	3	$	(1,419)	$	207,552

Classified as:
Cash equivalents							$	9,811							$	5,966
Short-term investments								157,717								201,586
Total							$	167,528							$	207,552

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


	September 30, 2016
	Amortized Cost		Fair Value
	(in thousands)
Less than one year	$	44,540	$	44,539
Greater than one year but less than five years		112,843		113,178
Total	$	157,383	$	157,717

- 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