Consolidated Statements of Changes in Stockholder's Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated other comprehensive income (loss)	LPC Offering	LPC Offering Common Stock	LPC Offering Additional Paid-In Capital	At The Market Offering	At The Market Offering Additional Paid-In Capital
Beginning balance (in shares) at Dec. 31, 2018		65,290,879
Beginning balance at Dec. 31, 2018	$ 36,200	$ 1	$ 513,336	$ (475,667)	$ (1,470)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock—restricted stock (in shares)		2,589,785
Compensation expense related to issued stock options and restricted stock awards	1,148		1,148
Net loss	(7,581)			(7,581)
Other comprehensive income (loss)	620				620
Ending balance (in shares) at Mar. 31, 2019		67,880,664
Ending balance at Mar. 31, 2019	$ 30,387	$ 1	514,484	(483,248)	(850)
Beginning balance (in shares) at Dec. 31, 2019	70,427,400	70,427,400
Beginning balance at Dec. 31, 2019	$ 16,347	$ 1	521,356	(504,145)	(865)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock—restricted stock (in shares)		78,324
Issuance of common stock—restricted stock	2
Issuance of common stock (in shares)							1,000,000
Issuance of common stock						$ 1,143		$ 1,143	$ (2)	$ (2)
Compensation expense related to issued stock options and restricted stock awards	766		766
Net loss	(9,353)
Other comprehensive income (loss)	$ 612				612
Ending balance (in shares) at Mar. 31, 2020	71,505,724	71,505,724
Ending balance at Mar. 31, 2020	$ 9,515	$ 1	$ 523,265	$ (513,498)	$ (253)