Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2019

Schedule of available-for-sale securities


	March 31, 2019								December 31, 2018
	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	$	588	$	—	$	—	$	588	$	26,539	$	—	$	—	$	26,539
U.S. Treasury securities		57,857		62		(287)		57,632		76,061		29		(405)		75,685
U.S. agency securities		13,010		—		(72)		12,938		13,017		—		(126)		12,891
Municipal securities		23,204		55		(24)		23,235		18,935		7		(57)		18,885
Total	$	94,659	$	117	$	(383)	$	94,393	$	134,552	$	36	$	(588)	$	134,000

Classified as:
Cash equivalents							$	588							$	26,539
Short-term investments								93,805								107,461
Total							$	94,393							$	134,000

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


	March 31, 2019
	Amortized Cost		Fair Value
	(in thousands)
Less than one year	$	57,974	$	57,910
Greater than one year but less than five years		36,097		35,895
Total	$	94,071	$	93,805

- 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