Marketable Securities

6 Months Ended

Jun. 30, 2019

Marketable Securities [Abstract]

Marketable Securities

9.  Marketable Securities

All marketable securities were classified as held-to-maturity as of the dates presented and the carrying amounts of held-to-maturity securities were as follows:

(in thousands)	June 30, 2019		December 31, 2018		June 30, 2018
U.S. Government and agency obligations	$	41,037	$	24,996	$	15,000
Corporate bonds		—		5,006		5,014
Total short-term marketable securities		41,037		30,002		20,014
U.S. Government and agency obligations		20,000		36,098		61,191
Total long-term marketable securities		20,000		36,098		61,191
Total marketable securities	$	61,037	$	66,100	$	81,205

Scheduled maturities of held-to-maturity investments were as follows:

(in thousands)	June 30, 2019
Due within one year	$	41,037
Due in one to five years		20,000
Total	$	61,037