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Investments (Tables)
9 Months Ended
Sep. 30, 2021
Investments  
Schedule of securities classified as held-to-maturity

Gross

Gross

Amortized

Unrealized

Unrealized

Fair

    

Cost

    

Gains

    

Losses

    

Value

(in thousands)

Corporate bonds

$

513

$

$

(1)

$

512

Municipal bonds

2,527

2,527

Total investments as of September 30, 2021

$

3,040

$

$

(1)

$

3,039

Corporate bonds

$

1,560

$

$

(1)

$

1,559

Municipal bonds

2,297

(1)

2,296

Total investments as of December 31, 2020

$

3,857

$

$

(2)

$

3,855