Shareholders' Equity (Tables)

3 Months Ended

Mar. 31, 2020

Equity [Abstract]

Schedule of Stockholders Equity

			Additional
	Common		Paid-In		Accumulated
	Stock		Capital		Deficit		Total
		(In thousands)
Balance January 1, 2020	$	542	$	625,048	$	(734,611)	$	(109,021)
Exercise of stock options		3		2,709		—		2,712
Stock-based compensation expense		—		3,476		—		3,476
Net loss		—		—		(29,031)		(29,031)
Balance March 31, 2020	$	545	$	631,233	$	(763,642)	$	(131,864)

			Additional
	Common		Paid-In		Accumulated
	Stock		Capital		Deficit		Total
		(In thousands)
Balance January 1, 2019	$	490	$	549,479	$	(650,125)	$	(100,156)
Exercise of stock options		—		108		—		108
Stock-based compensation expense		—		3,374		—		3,374
Net loss		—		—		(24,345)		(24,345)
Balance March 31, 2019	$	490	$	552,961	$	(674,470)	$	(121,019)