Debt - Future Principal Payment Requirements on Outstanding Secured Debt (Parenthetical) (Detail)					12 Months Ended
		Mar. 29, 2019	Feb. 23, 2019	Feb. 23, 2018	Dec. 31, 2018
Courtyard Initial Bridge Loan [Member]
Debt Instrument [Line Items]
Loan maturity date	[1]				Aug. 31, 2019
Loan maturity conditional maturity date					Apr. 30, 2020
Commitment fee percentage on loan principal outstanding					0.50%
Utah Bridge Loan [Member]
Debt Instrument [Line Items]
Loan maturity date				Feb. 23, 2019	Apr. 30, 2020	[2]
Loan maturity conditional maturity date					Aug. 23, 2019
Commitment fee percentage on loan principal outstanding					0.50%
Utah Bridge Loan [Member] | Subsequent Event
Debt Instrument [Line Items]
Loan maturity date		Apr. 30, 2020	Aug. 23, 2019

[1] Variable rate debt with interest only payments due monthly. The variable rate reflected in the table was the rate in effect as of December 31, 2018. The loan may be extended eight months from the maturity date upon the payment of a fee equal to 0.50% of the outstanding principal balance of the loan at the time of such extension and certain other terms are met, such as there has not been an event of default.

[2] Variable rate debt with interest only payments due monthly. The variable rate reflected in the table was the rate in effect as of December 31, 2018. On February 23, 2019, we elected to exercise an option available to us under the current loan agreement to extend the maturity date six months to August 23, 2019. On March 29, 2019, we amended the loan agreement to further extend the loan maturity date to April 30, 2020. Please see Note 11 – Subsequent Events for additional detail.