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Investments (Tables)
 3 Months Ended
Mar. 31, 2023
Investments  
Schedule of securities classified as held-to-maturity

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Gross

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Gross

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​

​

​

Amortized

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Unrealized

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Unrealized

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Fair

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Cost

    

Gains

    

Losses

    

Value

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(in thousands)

Corporate and agency bonds (due within 1 year)

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$

19,101

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$

—

​

$

(29)

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$

19,072

Municipal bonds (due within 1 year)

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​

878

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​

—

​

​

—

​

​

878

Total investments as of March 31, 2023

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$

19,979

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$

—

​

$

(29)

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$

19,950

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​

​

​

​

​

​

​

​

​

​

​

​

Corporate and agency bonds (due within 1 year)

​

$

21,612

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$

—

​

$

(60)

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$

21,552

Municipal bonds (due within 1 year)

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​

1,903

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​

—

​

​

(2)

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​

1,901

Total investments as of December 31, 2022

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$

23,515

​

$

—

​

$

(62)

​

$

23,453

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