Consolidated Statements of Changes in Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Deficit [Member]	Total
Beginning Balance at Dec. 31, 2016		$ 85,461	$ (92,535)	$ (7,074)
Beginning Balance, Shares at Dec. 31, 2016	1,437,442
Stock-based compensation		127		127
Issuance of restricted stock		179		179
Issuance of restricted stock, Shares	7,183
Issuance of common stock		480		480
Issuance of common stock, Shares	70,274
Net loss			(52,411)	(52,411)
Ending Balance at Dec. 31, 2017		86,247	(144,946)	(58,699)
Ending Balance, Shares at Dec. 31, 2017	1,514,899
Stock-based compensation		814		814
Issuance of common stock		79,098		79,098
Issuance of common stock, Shares	11,657,280
Issuance of warrants (note 6)		5,114		5,114
Net loss			(70,099)	(70,099)
Ending Balance at Dec. 31, 2018		$ 171,273	$ (215,045)	$ (43,772)
Ending Balance, Shares at Dec. 31, 2018	13,172,179