CONSOLIDATED STATEMENT 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, 2017		32,878
Beginning balance, amount at Dec. 31, 2017	$ 22,032	$ 33	$ 50,495	$ (28,496)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Options exercised (in shares)		37
Options exercised	83		83
Warrants exercised (in shares)		40
Warrants exercised	95		95
Stock based compensation	749		749
Stock exercise to acquire options and warrants (in shares)		(42)
Stock exercise to acquire options	(178)		(178)
Net loss	(1,207)			(1,207)
Ending balance (in shares) at Jun. 30, 2018		32,913
Ending balance, amount at Jun. 30, 2018	21,574	$ 33	51,244	(29,703)
Beginning balance (in shares) at Mar. 31, 2018		32,878
Beginning balance, amount at Mar. 31, 2018	21,469	$ 33	50,867	(29,431)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Options exercised (in shares)		37
Options exercised	83		83
Warrants exercised (in shares)		40
Warrants exercised	95		95
Stock based compensation	377		377
Stock exercise to acquire options and warrants (in shares)		(42)
Stock exercise to acquire options	(178)		(178)
Net loss	(272)			(272)
Ending balance (in shares) at Jun. 30, 2018		32,913
Ending balance, amount at Jun. 30, 2018	21,574	$ 33	51,244	(29,703)
Beginning balance (in shares) at Dec. 31, 2018		33,705
Beginning balance, amount at Dec. 31, 2018	87,768	$ 34	52,221	35,513
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Options exercised (in shares)		309
Options exercised	777		777
Stock based compensation	1,715		1,715
Stock exercise to acquire options and warrants (in shares)		(93)
Stock exercise to acquire options	(662)		(662)
Net loss	(9,019)			(9,019)
Ending balance (in shares) at Jun. 30, 2019		33,921
Ending balance, amount at Jun. 30, 2019	80,579	$ 34	54,051	26,494
Beginning balance (in shares) at Mar. 31, 2019		33,891
Beginning balance, amount at Mar. 31, 2019	84,013	$ 34	53,147	30,832
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Options exercised (in shares)		38
Options exercised	0
Stock based compensation	856		856
Stock exercise to acquire options and warrants (in shares)		(8)
Stock exercise to acquire options	48		48
Net loss	(4,338)			(4,338)
Ending balance (in shares) at Jun. 30, 2019		33,921
Ending balance, amount at Jun. 30, 2019	$ 80,579	$ 34	$ 54,051	$ 26,494