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Stock-Based Compensation and Stock Options (Details) - Stock Options $ / shares in Units, $ in Thousands		1 Months Ended							3 Months Ended		6 Months Ended		12 Months Ended
	May 29, 2020 $ / shares shares	Sep. 30, 2019 $ / shares shares	May 31, 2019 installment $ / shares shares	Jun. 30, 2018 $ / shares shares	May 31, 2018 $ / shares shares	Oct. 31, 2017 $ / shares shares	Mar. 31, 2016 $ / shares shares	Sep. 30, 2015 $ / shares shares	Jun. 30, 2020 USD ($) shares	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) shares	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2015 shares
September 2015 Plan
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
October 2017 Plan
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						$ 6.95
Options exercised (in shares)													250,000
Total stock-based compensation expense | $													$ 150
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
Total stock-based compensation expense | $									$ 193
Unrecognized stock-based compensation expense | $									$ 2,100		$ 2,100
Expected duration for recognition of stock based compensation expense (in years)											3 years 2 months 12 days
Options forfeited (in shares)									100,000
Options vested and become exercisable annually (in shares)		75,000
September 2019 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		$ 10.79
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
May 2020 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Employee options granted to purchase shares of common stock (in shares)	400,000										100,000		1,900,000		400,000	150,000
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares	$ 3.49
Total stock-based compensation expense | $									$ 3,600
Unrecognized stock-based compensation expense | $									2,300		$ 2,300
Expected duration for recognition of stock based compensation expense (in years)											1 year 6 months
Shares issued upon exercise of options (in shares)	300,000
Share price (in dollars per share) | $ / shares	$ 3.49
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
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares	$ 3.49
Total stock-based compensation expense | $									385
Unrecognized stock-based compensation expense | $									2,700		$ 2,700
Expected duration for recognition of stock based compensation expense (in years)											1 year 9 months
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 | $									20
Unrecognized stock-based compensation expense | $									766		$ 766
Expected duration for recognition of stock based compensation expense (in years)											3 years 9 months
March 2016 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Employee options granted to purchase shares of common stock (in shares)							150,000
Exercise price of employee option shares of common stock (in dollars per share) | $ / shares							$ 8.55
Options exercised (in shares)													50,000
Total stock-based compensation expense | $														$ (59)	$ (19)
Options forfeited (in shares)														50,000	37,500
Options canceled (in shares)															12,500
Shares issued upon exercise of options (in shares)													4,000
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 | $									$ 11	$ 22	$ 34	$ 45
Options forfeited (in shares)									25,000
Options outstanding (in shares)									25,000		25,000
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 | $										$ 7	$ (43)	$ 32
Options forfeited (in shares)											37,500
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 | $									$ (107)
Options forfeited (in shares)									75,000
Options outstanding (in shares)									25,000		25,000
Options vested (in shares)			10,000
Number of installments | installment			3
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
May 2019 Plan | May 20, 2021
Share-based Compensation Arrangement by Share-based Payment Award
Options vested and exercisable in future periods (in shares)			75,000

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