Income Taxes - Summary of Deferred Tax Assets and Liabilities (Detail) - USD ($)	Mar. 31, 2019	Mar. 31, 2018
Deferred tax assets:
Accrued liabilities not currently deductible	$ 6,277,000	$ 5,703,000
Allowance for doubtful accounts	1,422,000	1,151,000
Stock-based compensation	1,833,000	1,631,000
Accrued rent	1,474,000	1,555,000
Other	1,123,000	896,000
Deferred tax assets	12,129,000	10,936,000
Deferred tax liabilities:
Excess of book over tax basis of fixed assets	(10,836,000)	(11,191,000)
Intangible assets	(4,438,000)	(4,169,000)
Accrued revenue	(2,354,000)	0
Other	(242,000)	(179,000)
Total deferred tax liabilities	(17,870,000)	(15,539,000)
Valuation allowance	(553,000)	(236,000)
Deferred tax liabilities	(18,423,000)	(15,775,000)
Net deferred tax liability	$ (6,294,000)	$ (4,839,000)