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Investments (Tables)
12 Months Ended
Dec. 31, 2020
Investments [Abstract]  
Summary investment holdings The amortized cost, gross unrealized gains and losses, and fair value of our investments as measured using Level 2 inputs as of December 31, 2020 and 2019 (in thousands) were as follows:
December 31, 2020December 31, 2019
Amortized
Cost
Gross UnrealizedFair ValueAmortized
Cost
Gross UnrealizedFair Value
  GainsLossesGainsLosses
U.S. Treasury bills$8,909 $384 $— $9,293 $10,784 $270 $— $11,054 
Corporate bonds1,707 132 — 1,839 1,705 70 — 1,775 
Collateralized mortgage obligations3,433 149 — 3,582 5,472 56 (5)5,523 
Corporate stock130 — — 130 — — — — 
Yankees598 49 — 647 597 30 — 627 
Total investments$14,777 $714 $— $15,491 $18,558 $426 $(5)$18,979 
Investments classified by contractual maturity date
The amortized cost and fair value of our investments by contractual maturities as of December 31, 2020 and 2019 (in thousands) were as follows:
December 31, 2020December 31, 2019
  Amortized CostFair ValueAmortized CostFair Value
Due in one year or less$3,858 $3,915 $1,807 $1,810 
Due after one year through five years10,919 11,576 16,121 16,542 
Due after five years through ten years— — 630 627 
Total investments$14,777 $15,491 $18,558 $18,979