Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	Total
Balance at Dec. 31, 2017	$ 424	$ 114,302	$ 8,727	$ 123,453
Balance (in shares) at Dec. 31, 2017	42,398,140
Issuance of common stock upon exercise of stock options		17		$ 17
Issuance of common stock upon exercise of stock options (in shares)	5,000			5,000
Issuance of common stock for services	$ 2	346		$ 348
Issuance of common stock for services (in shares)	199,291
Value of share-based arrangements		1,054		1,054
Net income (loss)			(55,659)	(55,659)
Balance at Dec. 31, 2018	$ 426	115,719	(46,932)	69,213
Balance (in shares) at Dec. 31, 2018	42,602,431
Issuance of common stock upon exercise of stock options		9		$ 9
Issuance of common stock upon exercise of stock options (in shares)	10,000			10,000
Issuance of common stock for services		10		$ 10
Issuance of common stock for services (in shares)	16,129
Value of share-based arrangements		1,819		1,819
Net income (loss)			(25,940)	(25,940)
Balance at Dec. 31, 2019	$ 426	$ 117,557	$ (72,872)	$ 45,111
Balance (in shares) at Dec. 31, 2019	42,628,560