Stockholders' Equity - Issuance of Common Stock (Details) - Directors - Restricted Stock			3 Months Ended		6 Months Ended
	Jul. 01, 2019 director shares	Jul. 02, 2018 director shares	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	May 20, 2019 USD ($)	May 23, 2018 USD ($)
Share-based compensation
Fair value of equity grant award approved for each director | $							$ 50,000	$ 50,000
Number of restricted stock awards granted | shares	5,708	2,778
Number of directors granted restricted stock awards | director	2	1
Number of directors who elected to receive cash in lieu of the stock | director	2	3
Maximum
Share-based compensation
Stock compensation expense | $			$ 100,000	$ 100,000	$ 100,000	$ 100,000