Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Schedule of Fair Value of Company's Financial Assets and Liabilities

The following table presents the fair value of the Company’s financial assets and liabilities determined using the inputs defined above (amounts in thousands).

	June 30, 2018
	Level 1		Level 2		Level 3		Total
Assets
Money market funds	$	13,042	$	—	$	—	$	13,042
U.S. government securities	—			4,472	—			4,472
Corporate notes	—			21,855	—			21,855
Commercial paper	—			44,842	—			44,842
Total	$	13,042	$	71,169	$	—	$	84,211

	December 31, 2017
	Level 1		Level 2		Level 3		Total
Assets
Money market funds	$	5,574	$	—	$	—	$	5,574
U.S. government securities		—		24,940		—		24,940
Corporate notes		—		24,503		—		24,503
Commercial paper		—		47,243		—		47,243
Total	$	5,574	$	96,686	$	—	$	102,260