Stockholders’ Equity - Private placement (Details) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended	12 Months Ended
	Dec. 02, 2017	Aug. 11, 2017	Jun. 30, 2016	Jan. 28, 2017	Feb. 03, 2018
Common Stock
Preferred stock, shares authorized				1,000,000	1,000,000
Stock repurchased and retired			60,082
Per share price of shares repurchased (in dollars per share)			$ 12.24
Aggregate purchase price of stock repurchased and retired			$ 700	$ 735
Private placement financing
Common Stock
Public offering, number of shares issued		947,870
Offering price per share		$ 4.22
Net proceeds received from the Offering		$ 3,900
Over-Allotment Option
Common Stock
Public offering, number of shares issued	4,237,750
Offering price per share	$ 9.50
Net proceeds received from the Offering	$ 37,000