Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands				3 Months Ended			6 Months Ended		12 Months Ended
	Apr. 18, 2019	Jan. 02, 2019	Dec. 28, 2018	Jun. 30, 2019	Mar. 31, 2019	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Jun. 25, 2019
Shareholders' Equity Disclosure [Abstract]
Shares repurchased (in shares)			100,000
Shares repurchased			$ 1,400		$ 727
Treasury stock				$ (344)			$ (344)		$ (668)	$ (300,000)
Warrants outstanding (in shares)				14,102			14,102
Exercise price of warrants (in dollars per share)				$ 24.82			$ 24.82
Warrants expiry date				Jun. 28, 2023			Jun. 28, 2023
Gross proceeds, offering amount							$ 86,080	$ 78,518
Warrants Exercisable for Common Shares [Member]
Shareholders' Equity Disclosure [Abstract]
Number of shares issuable on exercise of warrants outstanding (in shares)				14,102			14,102
Common Stock [Member]
Shareholders' Equity Disclosure [Abstract]
Shares repurchased (in shares)					0
Shares repurchased					$ 0
Number of shares settled (in shares)		50,000							50,000
Average price of shares (in dollars per share)		$ 14.50							$ 13.36
Prepaid Expense									$ 700
Common stock shares issued (in shares)				5,175,000		6,325,000
Common Stock [Member] | IPO [Member]
Shareholders' Equity Disclosure [Abstract]
Common stock shares issued (in shares)	5,175,000
Number of shares issued from the exercise of the underwriters' option (in shares)	675,000
Public offering price (in dollars per share)	$ 17.50
Net proceeds, offering amount	$ 86,100						$ 86,100
Offering costs	4,500
Gross proceeds, offering amount	$ 90,600
Treasury Stock [Member]
Shareholders' Equity Disclosure [Abstract]
Shares repurchased					$ 725