Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2020

Investments, Debt and Equity Securities [Abstract]

Schedule of reconciliation of available-for-sale debt securities from amortized cost to fair value

The amortized cost, gross unrealized holding gains, gross unrealized holding losses and fair value of available-for-sale debt securities by type of security at September 30, 2020 was as follows:

	Amortized Cost		Allowance for Credit Losses		Net Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Corporate bonds
U.S.	$	136,664	$	—	$	136,664	$	3	$	(69)	$	136,598
Foreign	16,084		—		16,084		—		(14)		16,070
Government related obligations
U.S.	79,947		—		79,947		7		—		79,954
Total	$	232,695	$	—	$	232,695	$	10	$	(83)	$	232,622

Schedule of available-for-sale debt securities by classification

The fair values of debt securities available-for-sale by classification in the condensed consolidated balance sheets were as follows:

	September 30, 2020
Cash and cash equivalents	$	2,639
Marketable securities	229,983
Total	$	232,622

Schedule of available-for-sale debt securities by contractual maturity

The net amortized cost and fair value of debt securities available-for-sale at September 30, 2020 are shown below by contractual maturity. Actual maturities may differ from contractual maturities because securities may be restructured, called or prepaid, or the Company intends to sell a security prior to maturity.

	Net Amortized Cost		Fair Value
Due to mature:
Less than one year	$	224,672	$	224,615
One year through five years	8,023		8,007
Total	$	232,695	$	232,622

Schedule of net investment income

Sources of net investment income included in other under other income (expense) in the condensed consolidated statements of operations for the three and nine months ended September 30, 2020 were as follows:

	Three Months Ended September 30,		Nine Months Ended September 30,
	2020		2020
Gross investment income from debt securities available-for-sale	$	36	$	36
Investment expenses	—		—
Net investment income (excluding net realized capital gains or losses)	36		36
Net realized capital gains (losses)	—		—
Net investment income	$	36	$	36