The marketable securities are classified as available-for-sale and consist of corporate notes and commercial paper. The fair value measurement data for marketable securities is obtained from independent pricing services. The Company validates the prices provided by the third-party pricing services by understanding the valuation methods and data sources used and analyzing the pricing data in certain instances.

The following table summarizes the marketable securities held at June 30, 2019 (in thousands):

	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value
Commercial paper	$	13,082	$	—	$	—	$	13,082
Corporate notes		10,040		12		—		10,052
Total	$	23,122	$	12	$	—	$	23,134

All marketable securities held at June 30, 2019 had contractual maturities of less than one year. There were no realized gains or losses recognized on the sale or maturity of available-for-sale debt securities during the six months ended June 30, 2019 and as a result, the Company did not reclassify any amounts out of accumulated comprehensive loss. There were no impairment charges related to marketable securities for the six months ended June 30, 2019.