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Financial Instruments
6 Months Ended
Jun. 30, 2019
Financial Instruments Owned At Fair Value [Abstract]  
Financial Instruments

4. Financial Instruments

The fair value and amortized cost of cash equivalents and available-for-sale investments by major security type are presented in the following table (in thousands):

 

 

 

June 30, 2019

 

 

 

Amortized

cost

 

 

Unrealized

gain

 

 

Unrealized

loss

 

 

Estimated

Fair

Value

 

Cash equivalents and investments:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Money market fund

 

$

12,158

 

 

$

 

 

$

 

 

$

12,158

 

U.S. treasury bills

 

 

18,376

 

 

 

12

 

 

 

 

 

 

18,388

 

Repurchase agreement

 

 

15,000

 

 

 

 

 

 

 

 

 

15,000

 

Corporate debt securities

 

 

18,107

 

 

 

26

 

 

 

(2

)

 

 

18,131

 

Commercial paper

 

 

9,917

 

 

 

 

 

 

 

 

 

9,917

 

U.S. government bonds

 

 

4,494

 

 

 

1

 

 

 

 

 

 

4,495

 

Asset back securities

 

 

12,036

 

 

 

10

 

 

 

(1

)

 

 

12,045

 

Total cash equivalents and investments

 

$

90,088

 

 

$

49

 

 

$

(3

)

 

$

90,134

 

Classified as:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cash equivalents

 

 

 

 

 

 

 

 

 

 

 

 

 

$

31,651

 

Short-term investments

 

 

 

 

 

 

 

 

 

 

 

 

 

 

42,375

 

Long-term investments

 

 

 

 

 

 

 

 

 

 

 

 

 

 

16,108

 

Total cash equivalents and investments

 

 

 

 

 

 

 

 

 

 

 

 

 

$

90,134

 

 

As of June 30, 2019, the remaining contractual maturities of available-for-sale investments were less than two years. There have been no significant realized losses on available-for-sale investments for the period presented. During the six months ended June 30, 2019, the Company did not recognize any other-than-temporary impairment losses.