Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2019

Investments Debt And Equity Securities [Abstract]

Schedule of Fair Value Marketable Securities By Type of Security

As of June 30, 2019, the fair value of marketable securities by type of security was as follows (in thousands):

	Amortized		Unrealized		Unrealized		Fair
Description	Cost		Gains		Losses		Value
U.S. government agency securities and treasuries	$	111,255	$	170	$	—	$	111,425
Total	$	111,255	$	170	$	—	$	111,425

As of December 31, 2018, the fair value of marketable securities by type of security was as follows (in thousands):

	Amortized		Unrealized		Unrealized		Fair
Description	Cost		Gains		Losses		Value
U.S. government agency treasuries and securities	$	101,027	$	—	$	41	$	100,986
Total	$	101,027	$	—	$	41	$	100,986

Schedule of Fair Value and Amortized Cost of Company's Available-for-Sale Securities by Contractual Maturity

The estimated fair value and amortized cost of the Company’s available-for-sale securities by contractual maturity are summarized as follows (in thousands):

	June 30, 2019
	Amortized		Fair
	Cost		Value
Due in one year or less	$	111,255	$	111,425
Total	$	111,255	$	111,425

	December 31, 2018
	Amortized		Fair
	Cost		Value
Due in one year or less	$	101,027	$	100,986
Total	$	101,027	$	100,986