Fair Value Measurements -Schedule of Valued Using a Monte Carlo Simulation Valuation Model (Detail) - Additional Advance Warrant Liability [Member]	Jun. 25, 2018	Mar. 28, 2018
Measurement Input, Price Volatility % [Member]
Warrants and Rights Outstanding, Measurement Input	55.10	55.20
Measurement Input, Risk Free Interest Rate % [Member]
Warrants and Rights Outstanding, Measurement Input	2.80	1.70
Measurement Input, Expected Term (in years) [Member]
Warrants and Rights Outstanding, Measurement Input	7	7
Measurement Input, Dividend Rate % [Member]
Warrants and Rights Outstanding, Measurement Input	0	0
Measurement Input, Valuation Date Stock Price % [Member]
Warrants and Rights Outstanding, Measurement Input	1.93	1.07
Measurement Input, Probability of Issuance % [Member]
Warrants and Rights Outstanding, Measurement Input	100	80