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Stock-Based Compensation and Stock Options (Details) $ / shares in Units, $ in Thousands		1 Months Ended						3 Months Ended		12 Months Ended
	May 29, 2020 employee $ / shares shares	Sep. 30, 2019 employee $ / shares shares	May 31, 2019 installment $ / shares shares	Jun. 30, 2018 $ / shares shares	May 31, 2018 $ / shares shares	Oct. 31, 2017 $ / shares shares	Sep. 30, 2015 $ / shares shares	Mar. 31, 2021 USD ($) shares	Mar. 31, 2020 USD ($) shares	Dec. 31, 2020 shares	Dec. 31, 2019 shares	Dec. 31, 2015 shares
Share-based Compensation Arrangement by Share-based Payment Award
Employee options granted to purchase shares of common stock (in shares)								178,349
Total stock-based compensation expense (reversal) | $									$ 44
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Employee options granted to purchase shares of common stock (in shares)										54,258
Stock Options | September 2015 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Employee options granted to purchase shares of common stock (in shares)								100,000
Stock Options | September 2015 Plan | Mr. Ralph Bartel
Share-based Compensation Arrangement by Share-based Payment Award
Employee options granted to purchase shares of common stock (in shares)							400,000
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares							$ 8.07
Stock Options | October 2017 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Employee options granted to purchase shares of common stock (in shares)								300,000
Stock Options | October 2017 Plan | Mr. Ralph Bartel
Share-based Compensation Arrangement by Share-based Payment Award
Employee options granted to purchase shares of common stock (in shares)						400,000						150,000
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares						$ 6.95
Options exercised (in shares)											250,000
Stock Options | September 2019 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Employee options granted to purchase shares of common stock (in shares)		300,000
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares		$ 10.79
Options vested and become exercisable annually (in shares)		75,000
Total stock-based compensation expense (reversal) | $								$ 55
Unrecognized stock-based compensation expense | $								$ 934
Expected duration for recognition of stock based compensation expense								2 years 4 months 24 days
Stock Options | September 2019 Plan | Mr. Ralph Bartel
Share-based Compensation Arrangement by Share-based Payment Award
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares		$ 10.79
Options vested and become exercisable annually (in shares)		400,000
Total stock-based compensation expense (reversal) | $								$ 382
Unrecognized stock-based compensation expense | $								$ 1,100
Expected duration for recognition of stock based compensation expense								9 months 18 days
Stock Options | September 2019 Plan | Key Employees
Share-based Compensation Arrangement by Share-based Payment Award
Employee options granted to purchase shares of common stock (in shares)		50,000
Number of key employees | employee		6
Stock Options | May 2020 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Employee options granted to purchase shares of common stock (in shares)	100,000							26,667		100,000
Options forfeited (in shares)								75,000
Options vested and exercisable in future periods (in shares)								50,000		75,000
Share price (in dollars per share) | $ / shares	$ 3.49
Shares issued upon exercise of options (in shares)	300,000
Stock Options | May 2020 Plan | Mr. Ralph Bartel
Share-based Compensation Arrangement by Share-based Payment Award
Employee options granted to purchase shares of common stock (in shares)	800,000										1,900,000
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares	$ 3.49
Total stock-based compensation expense (reversal) | $								$ 385
Unrecognized stock-based compensation expense | $								1,500
Stock Options | May 2020 Plan | Key Employees
Share-based Compensation Arrangement by Share-based Payment Award
Employee options granted to purchase shares of common stock (in shares)	200,000
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares	$ 3.49
Total stock-based compensation expense (reversal) | $								59
Unrecognized stock-based compensation expense | $								$ 589
Expected duration for recognition of stock based compensation expense								3 years
Number of key employees | employee	2
Stock Options | May 2018 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Employee options granted to purchase shares of common stock (in shares)					50,000
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares					$ 14.70
Total stock-based compensation expense (reversal) | $									$ 22
Options forfeited (in shares)									25,000
Stock Options | June 2018 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Employee options granted to purchase shares of common stock (in shares)				50,000
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares				$ 16.65
Total stock-based compensation expense (reversal) | $									$ (43)
Options forfeited (in shares)									37,500
Stock Options | May 2019 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Employee options granted to purchase shares of common stock (in shares)			100,000
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares			$ 19.28
Total stock-based compensation expense (reversal) | $								$ (107)
Options forfeited (in shares)			75,000					75,000
Number of installments | installment			3
Options canceled (in shares)								25,000
Stock Options | May 2019 Plan | September 2019
Share-based Compensation Arrangement by Share-based Payment Award
Options vested and exercisable in future periods (in shares)			15,000
Stock Options | May 2019 Plan | May 2019
Share-based Compensation Arrangement by Share-based Payment Award
Options vested (in shares)			10,000
Stock Options | May 2019 Plan | Tranche One
Share-based Compensation Arrangement by Share-based Payment Award
Options vested and exercisable in future periods (in shares)			25,000
Stock Options | May 2019 Plan | Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award
Options vested and exercisable in future periods (in shares)			25,000
Stock Options | May 2019 Plan | Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award
Options vested and exercisable in future periods (in shares)			25,000

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