Stockholders’ Equity (Tables)

3 Months Ended

Mar. 31, 2021

Equity [Abstract]

Schedule of Changes in Stockholders’ Equity

The following tables present changes in stockholders’ equity for the three-month periods ended March 31, 2021 and 2020 (in thousands, except share data):

					Additional		Accumulated Other						Total
	Common				Paid-In		Comprehensive			Accumulated			Stockholders’
	Shares		Amount		Capital		Income (Loss)			Deficit			Equity
Balance at December 31, 2020		66,234,056	$	7	$	962,173	$	1		$	(435,109	)	$	527,072
Issuance of common stock through at-the-market    offerings, net of issuance costs of $52		641,709		-		45,255		-			-			45,255
Exercise of stock options		1,014,569		-		13,340		-			-			13,340
Equity-based compensation		-		-		6,424		-			-			6,424
Other comprehensive loss		-		-		-		(13	)		-			(13	)
Net loss		-		-		-		-			(46,205	)		(46,205	)
Balance at March 31, 2021		67,890,334	$	7	$	1,027,192	$	(12	)	$	(481,314	)	$	545,873
					Additional		Accumulated Other						Total
	Common				Paid-In		Comprehensive			Accumulated			Stockholders’
	Shares		Amount		Capital		Income			Deficit			Equity
Balance at December 31, 2019		50,198,044	$	5	$	570,493	$	261		$	(300,878	)	$	269,881
Issuance of common stock through at-the-market    offerings, net of issuance costs of $48		351,252		-		5,079		-			-			5,079
Exercise of stock options		53,579		-		336		-			-			336
Equity-based compensation		-		-		4,157		-			-			4,157
Other comprehensive income		-		-		-		112			-			112
Net loss		-		-		-		-			(31,806	)		(31,806	)
Balance at March 31, 2020		50,602,875	$	5	$	580,065	$	373		$	(332,684	)	$	247,759