Revolving Credit Facility - Additional Information (Detail) - USD ($)			9 Months Ended
	Nov. 30, 2017	Sep. 28, 2017	Oct. 28, 2017	Sep. 27, 2017	Feb. 28, 2017
Line of Credit Facility [Line Items]
Initial upfront payment			$ 14,873,000
Revolving line of credit classified as current liability			$ 2,250,000
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Commitment fee rate			0.25%
Term Loan [Member]
Line of Credit Facility [Line Items]
Credit facility, maximum borrowing capacity			$ 8,648,000
Second Amendment [Member]
Line of Credit Facility [Line Items]
Revolving credit facility termination and maturity date			Nov. 22, 2022
Second Amendment [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Credit facility, maximum borrowing capacity	$ 10,000,000
First Amendment [Member]
Line of Credit Facility [Line Items]
Revolving credit facility termination and maturity date			Jan. 31, 2022
First Amendment [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Credit facility, maximum borrowing capacity	15,000,000
Bank of America, N.A. [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit facility, maximum borrowing capacity					$ 10,000,000
Revolving loan outstanding			$ 14,600,000
Revolving line of credit classified as current liability			2,250,000
Bank of America, N.A. [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Credit facility, maximum borrowing capacity	15,000,000
Revolving line of credit	15,000,000
Bank of America, N.A. [Member] | Term Loan [Member]
Line of Credit Facility [Line Items]
Credit facility, maximum borrowing capacity					$ 9,200,000
Bank of America, N.A. [Member] | Credit Agreement Amendment [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit facility, maximum borrowing capacity		$ 15,000,000		$ 10,000,000
Initial upfront payment		$ 14,600,000
Interest on revolving line of credit		4.25%
Accrued interest for revolving credit facility			51,000
Credit facility, remaining borrowing capacity			400,000
Bank of America, N.A. [Member] | Second Amendment [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Revolving loan outstanding			$ 14,600,000
Bank of America, N.A. [Member] | Second Amendment [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Revolving line of credit	$ 15,000,000