Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2019

Fair Value Measurements

Schedule of assets and liabilities measured and recorded in financial statements at fair value on a recurring basis

	June 30, 2019
(In thousands)	Total		Level 1		Level 2		Level 3
Assets
Cash	$	250	$	250	$	—	$	—
Money market funds		36,647		36,647		—		—
Other cash equivalents – commercial paper		2,987		—		2,987		—
Short-term investments – commercial paper		3,496		—		3,496		—
Short-term investments – U.S. treasury bills		8,993		8,993		—		—
Total assets	$	52,373	$	45,890	$	6,483	$	—
Total liabilities	$	—	$	—	$	—	$	—
	December 31, 2018
(In thousands)	Total		Level 1		Level 2		Level 3
Assets
Cash	$	8,446	$	8,446	$	—	$	—
Money market funds		61,177		61,177		—		—
Other cash equivalents – commercial paper		1,808		—		1,808		—
Total assets	$	71,431	$	69,623	$	1,808	$	—
Total liabilities	$	—	$	—	$	—	$	—