Marketable Securities

6 Months Ended

Jun. 30, 2019

Investments, Debt and Equity Securities [Abstract]

All of the Company's marketable securities were available-for-sale and were classified based on their maturities. Short term investments are securities that original maturity or remaining maturity is greater than three months and not more than twelve months. The maturities of the long-term investments outstanding as of June 30, 2019 range from 15 to 17 months. The table below summarizes the marketable securities as of June 30, 2019 and December 31, 2018 (in thousands). Unrealized gains and losses on marketable securities are recorded in accumulated other comprehensive loss.



	June 30, 2019
	Amortized Cost		Unrealized Gains		Unrealized Losses		Aggregate Fair Value
Money market funds	$	6,294	$	—	$	—	$	6,294
Cash equivalents	6,294		—		—		6,294

U.S. treasury securities	77,526		65		—		77,591
Corporate bonds	14,168		21		—		14,189
Short-term investments	91,694		86		—		91,780

Corporate bonds	5,254		8		—		5,262
Long-term investments	5,254		8		—		5,262
Total marketable securities	$	103,242	$	94	$	—	$	103,336



	December 31, 2018
	Amortized Cost		Unrealized Gains		Unrealized Losses			Aggregate Fair Value
U.S. treasury securities	$	1,000	$	—	$	—		$	1,000
Commercial paper	6,635		—		—			6,635
Money market funds	15,223		—		—			15,223
Cash equivalents	22,858		—		—			22,858

U.S. treasury securities	65,491		2		(4		)	65,489
Corporate bonds	19,708		15		(3		)	19,720
Commercial paper	11,894		—		—			11,894
Short-term investments	97,093		17		(7		)	97,103
Total marketable securities	$	119,951	$	17	$	(7	)	$	119,961