Revolving Line of Credit - Additional Information (Detail) - Revolving Credit Facility [Member] - USD ($)	3 Months Ended
	Mar. 31, 2018	May 22, 2018	May 21, 2018	Dec. 31, 2015	Sep. 30, 2013
Line of Credit Facility [Line Items]
Additional borrowing credit facility				$ 5,000,000
Total credit facility borrowing capacity				20,000,000
Revolving credit facility period	3 years
Variable interest rate	The LIBOR Rate plus 1.5%
LIBOR Rate plus	1.50%
Annual commitment fee	0.15%
Due date of amounts outstanding under credit facility	Dec. 21, 2018
Amount drawn under credit facility	$ 5,000,000
Borrowing credit facility				$ 15,000,000	$ 10,000,000
Debt covenant terms and compliance	The Company was not in compliance with one of its loan covenants as of March 31, 2018. Subsequent to quarter-end, the Company has received a waiver of compliance for the period ending March 31, 2018 related to the failure to meet the Minimum Interest Coverage covenant. In connection with this waiver, the Company is required to maintain a minimum cash balance in the amount of $4 million through May 21, 2018, at which point in time the minimum cash balance required increases to $5 million.
Subsequent Event [Member]
Line of Credit Facility [Line Items]
Minimum cash balance requirement		$ 5,000,000	$ 4,000,000