CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]	Total
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of accounting change | ASC 606 [Member]			$ 2,500		$ 2,500
Balance at Dec. 31, 2017	$ 6	$ 177,076	(175,516)	$ (13)	1,553
Balance (in shares) at Dec. 31, 2017	59,051,978
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issued for cash, net		6,830			6,830
Stock issued for cash, net (in shares)	1,751,689
Stock-based compensation		887			887
Stock issued for vested RSUs (in shares)	20,000
Comprehensive income:
Net Loss			(7,605)		(7,605)
Other comprehensive income (loss), net of tax				1	1
Comprehensive loss					(7,604)
Balance at Mar. 31, 2018	$ 6	184,793	(180,621)	(12)	4,166
Balance (in shares) at Mar. 31, 2018	60,823,667
Balance at Dec. 31, 2017	$ 6	177,076	(175,516)	(13)	1,553
Balance (in shares) at Dec. 31, 2017	59,051,978
Comprehensive income:
Net Loss					(14,055)
Other comprehensive income (loss), net of tax					0
Comprehensive loss					(14,055)
Balance at Jun. 30, 2018	$ 6	190,723	(187,071)	(12)	3,646
Balance (in shares) at Jun. 30, 2018	62,292,807
Balance at Mar. 31, 2018	$ 6	184,793	(180,621)	(12)	4,166
Balance (in shares) at Mar. 31, 2018	60,823,667
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issued for cash, net		4,809			4,809
Stock issued for cash, net (in shares)	1,320,921
Stock-based compensation		1,121			1,121
Stock issued for vested RSUs (in shares)	148,219
Comprehensive income:
Net Loss			(6,450)		(6,450)
Other comprehensive income (loss), net of tax					(1)
Comprehensive loss					(6,451)
Balance at Jun. 30, 2018	$ 6	190,723	(187,071)	(12)	3,646
Balance (in shares) at Jun. 30, 2018	62,292,807
Balance at Dec. 31, 2018	$ 7	208,317	(198,422)	(14)	9,888
Balance (in shares) at Dec. 31, 2018	66,879,847
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issued for cash, net		2,848			2,848
Stock issued for cash, net (in shares)	560,338
Stock-based compensation		785			785
Exercise of options		816			816
Exercise of options (in shares)	663,816
Comprehensive income:
Net Loss			(5,608)		(5,608)
Other comprehensive income (loss), net of tax				1	1
Comprehensive loss					(5,607)
Balance at Mar. 31, 2019	$ 7	212,766	(204,030)	(13)	8,730
Balance (in shares) at Mar. 31, 2019	68,104,001
Balance at Dec. 31, 2018	$ 7	208,317	(198,422)	(14)	9,888
Balance (in shares) at Dec. 31, 2018	66,879,847
Comprehensive income:
Net Loss					(9,738)
Other comprehensive income (loss), net of tax					1
Comprehensive loss					(9,737)
Balance at Jun. 30, 2019	$ 7	216,543	(208,160)	(13)	8,377
Balance (in shares) at Jun. 30, 2019	68,754,547
Balance at Mar. 31, 2019	$ 7	212,766	(204,030)	(13)	8,730
Balance (in shares) at Mar. 31, 2019	68,104,001
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock issued for cash, net		2,849			2,849
Stock issued for cash, net (in shares)	467,928
Stock-based compensation		928			928
Stock issued for vested RSUs (in shares)	182,618
Comprehensive income:
Net Loss			(4,130)		(4,130)
Other comprehensive income (loss), net of tax					0
Comprehensive loss					(4,130)
Balance at Jun. 30, 2019	$ 7	$ 216,543	$ (208,160)	$ (13)	$ 8,377
Balance (in shares) at Jun. 30, 2019	68,754,547