Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2016

Schedule of available-for-sale securities


	December 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	$	10,777	$	—	$	—	$	10,777	$	5,966	$	—	$	—	$	5,966
U.S. Treasury securities		57,846		—		(404)		57,442		104,537		1		(725)		103,813
U.S. agency securities		56,261		—		(147)		56,114		79,491		—		(638)		78,853
Municipal securities		17,478		—		(174)		17,304		18,974		2		(56)		18,920
Total	$	142,362	$	—	$	(725)	$	141,637	$	208,968	$	3	$	(1,419)	$	207,552

Classified as:
Cash equivalents							$	10,777							$	5,966
Short-term investments								130,860								201,586
Total							$	141,637							$	207,552

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


	December 31, 2016
	Amortized Cost		Fair Value
	(in thousands)
Less than one year	$	48,265	$	48,212
Greater than one year but less than five years		83,320		82,648
Total	$	131,585	$	130,860

- 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