Short-term investments (Tables)

6 Months Ended

Jun. 30, 2020

Cash, Cash Equivalents, and Short-term Investments [Abstract]

Schedule of Available-for-sale Securities Reconciliation

The following tables summarize unrealized gains and losses related to our short-term investments designated as available-for-sale debt securities:

	As of June 30, 2020
(In thousands)	(Unaudited)
			Gross		Gross
	Adjusted Cost		Unrealized Gain		Unrealized Loss		Fair Value
Corporate bonds	$	136,698	$	467	$	(61)	$	137,104
Total Short-term investments	$	136,698	$	467	$	(61)	$	137,104

(In thousands)	As of December 31, 2019
			Gross		Gross
	Adjusted Cost		Unrealized Gain		Unrealized Loss		Fair Value
Corporate bonds	$	237,423	$	628	$	(68)	$	237,983
Total Short-term investments	$	237,423	$	628	$	(68)	$	237,983

Investments Classified by Contractual Maturity Date

The following tables summarize the contractual maturities of our short-term investments designated as available-for-sale debt securities:

	As of June 30, 2020
(In thousands)	(Unaudited)
	Adjusted Cost		Fair Value
Due in less than 1 year	$	99,137	$	99,500
Due in 1 to 5 years	37,561		37,604
Total available-for-sale debt securities	$	136,698	$	137,104
Due in less than 1 year	Adjusted Cost		Fair Value
Corporate bonds	$	99,137	$	99,500
Total available-for-sale debt securities	$	99,137	$	99,500
Due in 1 to 5 years	Adjusted Cost		Fair Value
Corporate bonds	$	37,561	$	37,604
Total available-for-sale debt securities	$	37,561	$	37,604