Condensed Consolidated Statements of Changes in Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Treasury Stock	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2018		12,233		0
Beginning balance at Dec. 31, 2018	$ 196,427	$ 122	$ 303,463	$ 0	$ (107,158)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock for Rights Offering (in shares)		3,382
Issuance of common stock for Rights Offering	32,175	$ 34	32,141
Issuance of common stock to employees (in shares)		97
Issuance of common stock to employees	0	$ 1	(1)
Treasury stock acquired through surrender of shares for tax withholding (in shares)				(34)
Treasury stock acquired through surrender of shares for tax withholding	(373)			$ (373)
Stock-based compensation	852		852
Net loss	(6,355)				(6,355)
Ending balance (in shares) at Mar. 31, 2019		15,712		34
Ending balance at Mar. 31, 2019	221,903	$ 157	336,455	$ (373)	(114,336)
Beginning balance (in shares) at Dec. 31, 2019		15,781		46
Beginning balance at Dec. 31, 2019	174,432	$ 158	337,628	$ (436)	(162,918)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock to employees (in shares)		40
Issuance of common stock to employees	0	$ 0	0
Treasury stock acquired through surrender of shares for tax withholding (in shares)				(14)
Treasury stock acquired through surrender of shares for tax withholding	(41)			$ (41)
Stock-based compensation	290		290
Net loss	(23,044)				(23,044)
Ending balance (in shares) at Mar. 31, 2020		15,821		60
Ending balance at Mar. 31, 2020	$ 151,637	$ 158	$ 337,918	$ (477)	$ (185,962)