Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Restricted Stock Units (RSUs) [Member] Management [Member] Common Stock [Member]	Restricted Stock Units (RSUs) [Member] Management [Member] Additional Paid-in Capital [Member]	Restricted Stock Units (RSUs) [Member] Management [Member] Retained Earnings [Member]	Restricted Stock Units (RSUs) [Member] Management [Member]	Restricted Stock Units (RSUs) [Member] Board of Directors [Member] Common Stock [Member]	Restricted Stock Units (RSUs) [Member] Board of Directors [Member] Additional Paid-in Capital [Member]	Restricted Stock Units (RSUs) [Member] Board of Directors [Member] Retained Earnings [Member]	Restricted Stock Units (RSUs) [Member] Board of Directors [Member]	Restricted Stock Units (RSUs) [Member] Common Stock [Member]	Restricted Stock Units (RSUs) [Member] Additional Paid-in Capital [Member]	Restricted Stock Units (RSUs) [Member] Retained Earnings [Member]	Restricted Stock Units (RSUs) [Member]	Public Offering [Member] Common Stock [Member]	Public Offering [Member] Additional Paid-in Capital [Member]	Public Offering [Member] Retained Earnings [Member]	Public Offering [Member]	The $8.5 Million Registered Direct Offering [Member] Common Stock [Member]	The $8.5 Million Registered Direct Offering [Member] Additional Paid-in Capital [Member]	The $8.5 Million Registered Direct Offering [Member] Retained Earnings [Member]	The $8.5 Million Registered Direct Offering [Member]	The $10.5 Million Registered Direct Offering [Member] Common Stock [Member]	The $10.5 Million Registered Direct Offering [Member] Additional Paid-in Capital [Member]	The $10.5 Million Registered Direct Offering [Member] Retained Earnings [Member]	The $10.5 Million Registered Direct Offering [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Dec. 31, 2018																									4,845,697
Balance at Dec. 31, 2018																									$ 5	$ 90,148	$ (86,361)	$ 3,792
Reverse stock split fractional share true up (in shares)																									(494)
Restricted stock units vested and issued (in shares)									27,426
Sale of common stock (in shares)																									1,741,667
Common stock issued																									$ 2	9,194		9,196
Issuance of stock and warrants from conversion of convertible notes (in shares)																									210,887
Issuance of stock and warrants from conversion of convertible notes																										1,204		1,204
Issuance of restricted stock units in lieu of 2018 cash bonus																										165		165
Share-based compensation																										2,722		2,722
Net loss																											(14,709)	(14,709)
Balance (in shares) at Dec. 31, 2019																									6,825,183
Balance at Dec. 31, 2019																									$ 7	103,433	(101,070)	2,370
Restricted stock units vested and issued (in shares)	71,624				39,807				26,172
Sale of common stock (in shares)													5,476,190				1,789,474				2,038,836
Common stock issued													$ 5	$ 10,268		$ 10,273	$ 2	$ 7,825		$ 7,827	$ 2	$ 9,763		$ 9,765
Share-based compensation																										2,952		2,952
Net loss																											(15,004)	(15,004)
Restricted stock units vested and issued
Restricted stock units issued		$ 232		$ 232		$ 613		$ 613
Common stock grants to former directors to settle board compensation obligations (in shares)																									29,625
Common stock grants to former directors to settle board compensation obligations																										148		148
Exercise of common stock warrants (in shares)																									470
Exercise of common stock warrants
Balance (in shares) at Dec. 31, 2020																									16,297,381
Balance at Dec. 31, 2020																									$ 16	$ 135,234	$ (116,074)	$ 19,176