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Investments
 3 Months Ended
Mar. 31, 2023
Investments, Debt and Equity Securities [Abstract]  
Investments

4. Investments

Investments by security type consisted of the following at March 31, 2023 and December 31, 2022 (in thousands):

 

 

 

March 31, 2023

 

 

 

Amortized
Cost

 

 

Gross
Unrealized
Gain

 

 

Gross
Unrealized
Loss

 

 

Fair
Value

 

Investments:

 

 

 

 

 

 

 

 

 

 

 

 

Commercial paper

 

$

4,983

 

 

$

—

 

 

$

—

 

 

$

4,983

 

Corporate bonds

 

 

2,248

 

 

 

1

 

 

 

—

 

 

 

2,249

 

Government securities

 

 

4,470

 

 

 

1

 

 

 

—

 

 

 

4,471

 

 

 

$

11,701

 

 

$

2

 

 

$

—

 

 

$

11,703

 

 

 

 

 

December 31, 2022

 

 

 

Amortized
Cost

 

 

Gross
Unrealized
Gain

 

 

Gross
Unrealized
Loss

 

 

Fair
Value

 

Investments:

 

 

 

 

 

 

 

 

 

 

 

 

Commercial paper

 

$

2,465

 

 

$

—

 

 

$

—

 

 

$

2,465

 

Corporate bonds

 

 

2,958

 

 

 

—

 

 

 

(1

)

 

 

2,957

 

Government securities

 

 

12,898

 

 

 

3

 

 

 

(12

)

 

 

12,889

 

 

 

$

18,321

 

 

$

3

 

 

$

(13

)

 

$

18,311

 

 

Investments with original maturities of less than 90 days are included in cash and cash equivalents on the condensed consolidated balance sheets and are not included in the table above. Investments with maturities of less than 12 months are considered current assets and those investments with maturities greater than 12 months are considered non-current assets.

Excluded from the tables above are restricted investments of $1,401 as the cost approximates current fair value as of March 31, 2023 and December 31, 2022, respectively.

As of March 31, 2023 and December 31, 2022, all of the Company's investments are classified as available-for-sale and mature within 12 months of the balance sheet date.