Convertible preferred stock Series A and common stock - Restatement (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Shareholders' equity
Preferred stock, $0.01 par value - Authorized: 10,000,000 shares; issued and outstanding: 0 and 453 shares (as reported and restated) as of December 31, 2016	[1]
Common stock, $0.01 par value - Authorized: 51,000,000; issued and outstanding: 5,774,549 and 4,818,178 (as reported and restated) as of December 31, 2016	[2]	$ 52	49
Additional paid in capital		1,457	1,129
Accumulated deficit		(1,407)	(264)
Total shareholders' equity		$ 102	$ 914	[3]
Preferred stock, par value per share			$ 0.01
Preferred stock, shares authorized			10,000,000
Preferred stock, shares issued			453
Preferred stock, shares outstanding			453
Common stock, par value per share		$ 0.01	$ 0.01
Common stock, shares authorized		51,000,000	51,000,000
Common stock, shares issued		5,153,380	4,818,178
Common stock, shares outstanding		5,153,380	4,818,178	[3]
Reverse stock split		one-for-fifty	one-for-fifty
As Reported [Member]
Shareholders' equity
Preferred stock, $0.01 par value - Authorized: 10,000,000 shares; issued and outstanding: 0 and 453 shares (as reported and restated) as of December 31, 2016
Common stock, $0.01 par value - Authorized: 51,000,000; issued and outstanding: 5,774,549 and 4,818,178 (as reported and restated) as of December 31, 2016			2,887
Additional paid in capital			(1,709)
Accumulated deficit			(264)
Total shareholders' equity			914
Adjustments [Member]
Shareholders' equity
Preferred stock, $0.01 par value - Authorized: 10,000,000 shares; issued and outstanding: 0 and 453 shares (as reported and restated) as of December 31, 2016	[1]
Common stock, $0.01 par value - Authorized: 51,000,000; issued and outstanding: 5,774,549 and 4,818,178 (as reported and restated) as of December 31, 2016			(2,838)
Additional paid in capital			2,838
Accumulated deficit
Total shareholders' equity

[1] Represents an amount lower than 1,000 USD

[2] 2016 Share data is retroactively adjusted to reflect the reverse stock split and the reverse recapitalization consummated in August 2016.

[3] Share data as of December 31, 2016 is restated (Note 8)