Short-Term Investments (Tables)

9 Months Ended

Sep. 30, 2019

Investments Disclosure [Abstract]

Summary of Investments Included in Cash Equivalents and Short Term Investments

The following table summarizes the Company’s investments, which are included in cash equivalents and short-term investments:

As of September 30, 2019	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
	(in thousands)
Money market mutual funds	$	36,883	$	—	$	—		$	36,883
Repurchase agreements		41,200		—		—			41,200
Asset-backed securities		11,582		12		—			11,594
Commercial paper		23,074		—		—			23,074
Corporate debt securities		92,418		210		—			92,628
U.S. Treasury securities		64,794		36		(4	)		64,826
Total	$	269,951	$	258	$	(4	)	$	270,205
As of December 31, 2018	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
	(in thousands)
Money market mutual funds	$	31,740	$	—	$	—		$	31,740
Asset-backed securities		19,541		—		(21	)		19,520
Commercial paper		78,571		—		—			78,571
Corporate debt securities		54,511		—		(50	)		54,461
U.S. Treasury securities		29,980		—		(6	)		29,974
Total	$	214,343	$	—	$	(77	)	$	214,266