CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings (Accumulated deficit)
Beginning balance (in shares) at Dec. 31, 2018		33,705
Beginning balance at Dec. 31, 2018	$ 87,177	$ 34	$ 52,920	$ 34,223
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Options exercised (in shares)		18
Options exercised for cash	67		67
Stock based compensation	1,195		1,195
Shares issued on net settlement of stock options (in shares)		168
Shares issued on net settlement of stock options	0
Net loss	(5,608)			(5,608)
Ending balance (in shares) at Mar. 31, 2019		33,891
Ending balance at Mar. 31, 2019	82,831	$ 34	54,182	28,615
Beginning balance (in shares) at Dec. 31, 2019		34,170
Beginning balance at Dec. 31, 2019	71,259	$ 34	56,708	14,517
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Options exercised (in shares)		10
Options exercised for cash	72		72
Stock based compensation	1,049		1,049
Shares issued on net settlement of stock options (in shares)		4
Shares issued on net settlement of stock options	0
Net loss	(1,951)			(1,951)
Ending balance (in shares) at Mar. 31, 2020		34,184
Ending balance at Mar. 31, 2020	$ 70,429	$ 34	$ 57,829	$ 12,566