Short-Term Investments

12 Months Ended

Dec. 31, 2018

Investments, Debt and Equity Securities [Abstract]

Short-Term Investments

Short-Term Investments

Our short-term investments are classified as available-for-sale and consist of the following:

	December 31, 2018
	Amortized		Unrealized Gross				Aggregate
	Cost		Gains		Losses		Fair Value
Commercial paper	$	27,898	$	—	$	—	$	27,898
Corporate bonds	28,043		—		(31)		28,012
Asset-backed securities	17,074		—		(19)		17,055
U.S. government securities	17,959		—		(2)		17,957
Short-term investments	$	90,974	$	—	$	(52)	$	90,922

	December 31, 2017
	Amortized		Unrealized Gross				Aggregate
	Cost		Gains		Losses		Fair Value
Commercial paper	$	5,384	$	—	$	—	$	5,384
Corporate bonds	1,804		—		—		1,804
Short-term investments	$	7,188	$	—	$	—	$	7,188

As of December 31, 2018 and 2017, we had no investments with a contractual maturity of greater than one year. Currently, we do not intend to sell the investments and it is not more likely than not that we will be required to sell the investments before

recovery of their amortized cost bases, which may be maturity. We do not consider those investments to be other-than-temporarily impaired at December 31, 2018.