Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2018

Investments, Debt and Equity Securities [Abstract]

Marketable securities - Gross unrealized gains/losses

The following table summarizes the Company’s marketable securities at December 31, 2018 and 2017 (in thousands):

December 31, 2018	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Corporate notes and bonds	$	6,393	$	—	$	(4	)	$	6,389
U.S. government and agency securities	—		—		—			—
Commercial paper	2,493		—		—			2,493
Total marketable securities	$	8,886	$	—	$	(4	)	$	8,882
December 31, 2017	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Corporate notes and bonds	$	26,303	$	—	$	(25	)	$	26,278
U.S. government and agency securities	11,981		—		(5		)	11,976
Commercial paper	6,982		—		—			6,982
Total marketable securities	$	45,266	$	—	$	(30	)	$	45,236

Marketable Securities - Contractual Maturities

The following table summarizes the maturities of the Company’s marketable securities at December 31, 2018 (in thousands):

	Amortized Cost		Estimated Fair Value
Due in one year or less	$	8,886	$	8,882
Total	$	8,886	$	8,882