Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) - USD ($)	Mar. 31, 2018	Mar. 31, 2017
Deferred tax assets:
Accrued liabilities not currently deductible	$ 5,703,000	$ 9,409,000
Allowance for doubtful accounts	1,151,000	1,153,000
Stock-based compensation	1,631,000	1,755,000
Accrued rent	1,555,000	2,219,000
Other	896,000	740,000
Deferred tax assets	10,936,000	15,276,000
Deferred tax liabilities:
Excess of book over tax basis of fixed assets	(11,191,000)	(15,666,000)
Intangible assets	(4,169,000)	(5,960,000)
Other	(179,000)	(336,000)
Total deferred tax liabilities	(15,539,000)	(21,962,000)
Valuation allowance	(236,000)	0
Deferred tax liabilities	(15,775,000)	(21,962,000)
Net deferred tax liability	$ (4,839,000)	$ (6,686,000)