Subsequent Events - Additional Information (Details) - USD ($)		12 Months Ended
	Mar. 29, 2018	Dec. 31, 2017	Mar. 28, 2018	Oct. 15, 2017	Dec. 31, 2016	Jan. 29, 2016
Subsequent Event [Line Items]
Common stock, shares authorized		450,000,000		19,900,000	19,900,000
Common stock, par value		$ 0.01		$ 0.01	$ 0.01	$ 0.01
Chief Executive Officer and President
Subsequent Event [Line Items]
Employment agreement term description		The employment agreement provides that, if Mr. Winmill’s employment is terminated by the Company without “cause” or by Mr. Winmill for “good reason” (each as defined in the employment agreement), or as a result of the Company’s notice of non-renewal of the employment term, Mr. Winmill will be entitled to the following severance payments and benefits, subject to the execution and non-revocation of a general release of claims:  accrued but unpaid base salary, bonus and other benefits earned and accrued but unpaid prior to the date of termination;  an amount equal to three times the sum of Mr. Winmill’s annual base salary plus the greater of the average annual bonus received by Mr. Winmill with respect to the two years prior to the year of termination and Mr. Winmill’s “target” annual bonus; and  continued health benefits (including for Mr. Winmill’s dependents) for twenty-four months following termination. In the event Mr. Winmill’s employment terminates by reason of his death or disability he or his estate shall receive:  accrued but unpaid base salary, bonus and other benefits earned and accrued but unpaid prior to the date of termination;  a prorated annual bonus for the year in which the termination occurs; and  continued health benefits (including for Mr. Winmill’s dependents) for twenty-four months following termination.
Subsequent Event | Chief Executive Officer and President
Subsequent Event [Line Items]
Employment agreement initial term	3 years
Employment agreement extensions term	1 year
Employment agreement notice period required for non renewal	90 days
Period of continued health benefits following termination	24 months
Non-competition and non-solicitation covenants period after employment agreement	12 months
Employment agreement base salary	$ 26,416
Subsequent Event | 2017 Equity Incentive Plan
Subsequent Event [Line Items]
Common stock, shares authorized			760,000
Common stock, par value			$ 0.01
Subsequent Event | 2017 Equity Incentive Plan
Subsequent Event [Line Items]
Number of shares, granted	73,155
Vesting period	3 months
Stock vested percentage	6.25%
Remaining vesting period	4 years
Subsequent Event | 2017 Equity Incentive Plan | Performance Based Grants
Subsequent Event [Line Items]
Number of shares, granted	15,025
Subsequent Event | 2017 Equity Incentive Plan | Time-Base Grants
Subsequent Event [Line Items]
Vesting period	3 years
Subsequent Event | 2017 Equity Incentive Plan | Minimum
Subsequent Event [Line Items]
Stock vested percentage based on achievement of goal	0.00%
Subsequent Event | 2017 Equity Incentive Plan | Maximum
Subsequent Event [Line Items]
Stock vested percentage based on achievement of goal	200.00%
Subsequent Event | 2017 Equity Incentive Plan | Chief Executive Officer and President
Subsequent Event [Line Items]
Number of shares, granted	32,125
Subsequent Event | 2017 Equity Incentive Plan | Chief Executive Officer and President | Continued Employment
Subsequent Event [Line Items]
Number of shares, granted	24,100
Subsequent Event | 2017 Equity Incentive Plan | Chief Executive Officer and President | Continued Employment and Achievement of certain AFFO and SSRG
Subsequent Event [Line Items]
Number of shares, granted	8,025
Subsequent Event | 2017 Equity Incentive Plan | Chief Financial Officer
Subsequent Event [Line Items]
Number of shares, granted	13,900
Subsequent Event | 2017 Equity Incentive Plan | Chief Financial Officer | Continued Employment
Subsequent Event [Line Items]
Number of shares, granted	10,400
Subsequent Event | 2017 Equity Incentive Plan | Chief Financial Officer | Continued Employment and Achievement of certain AFFO and SSRG
Subsequent Event [Line Items]
Number of shares, granted	3,500