Consolidated Statements of Changes in Stockholders’ Equity (Deficit) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2017		5,336
Beginning balance at Dec. 31, 2017	$ 122,934	$ 53	$ 148,866	$ (25,985)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation (in shares)		103
Share-based compensation	1,103	$ 1	1,102
Net loss	(32,607)			(32,607)
Ending balance at Dec. 31, 2018	91,430	$ 54	149,968	(58,592)
Ending balance (in shares) at Dec. 31, 2018		5,439
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation (in shares)		84
Share-based compensation	925	$ 1	924
Net loss	(68,399)			(68,399)
Ending balance at Dec. 31, 2019	$ 23,956	$ 55	$ 150,892	$ (126,991)
Ending balance (in shares) at Dec. 31, 2019		5,523