Credit Facility - Additional information (Detail) - USD ($)		6 Months Ended
	Apr. 19, 2018	Jun. 30, 2018	Apr. 20, 2018	Dec. 31, 2017	Apr. 19, 2017
Line of Credit Facility [Line Items]
Current borrowing capacity under line of credit facility		$ 12,000,000		$ 13,000,000
Payment of deferred financing costs		71,000
Debt financing costs		418,000		395,000
Long term debt		$ 33,382,000		34,149,000
Term Loan Facility [Member]
Line of Credit Facility [Line Items]
Line of credit, maturity date		Jul. 13, 2022
Outstanding borrowings amount		$ 27,600,000		29,500,000
Term Loan Facility [Member] | Installments Due on October 1 2017 Through and Including July 1 2018 [Member]
Line of Credit Facility [Line Items]
Line of credit, periodic payment percentage		3.125%
Term Loan Facility [Member] | Installments Payable on October 1 2018 Through and Including July 1 2021 [Member]
Line of Credit Facility [Line Items]
Line of credit, periodic payment percentage		3.75%
Term Loan Facility [Member] | Installments Payable on October 1 2021 Through and Including Maturity Date [Member]
Line of Credit Facility [Line Items]
Line of credit, periodic payment percentage		5.00%
Delayed Draw Term Loan [Member]
Line of Credit Facility [Line Items]
Credit facility maximum borrowing capacity		$ 7,000,000
Continent consideration payment arrangement borrowings multiplier amount		$ 1,000,000
Line of credit facility payment term description		The principal amount of each quarterly installment payable of each Delayed Draw Term Loan equals the product of the original balance of such Loan, multiplied by (i) 3.75% for quarterly installments due on October 1, 2018 through and including July 1, 2021; and (ii) 5.00% for quarterly installments payable on October 1, 2021 through and including the maturity date, with the maturity date payment equal to the outstanding amount of the loan on that date.
Delayed Draw Term Loan [Member] | Installments Payable on October 1 2021 Through and Including Maturity Date [Member]
Line of Credit Facility [Line Items]
Line of credit, periodic payment percentage		5.00%
Delayed Draw Term Loan [Member] | Installments Due On October 1, 2018 Through and Including July 1, 2021 [Member]
Line of Credit Facility [Line Items]
Line of credit, periodic payment percentage		3.75%
Revolving Line of Credit [Member]
Line of Credit Facility [Line Items]
Credit facility maximum borrowing capacity		$ 32,500,000	$ 32,500,000
Credit facility expiration period		5 years
Current borrowing capacity under line of credit facility	$ 27,500,000	$ 22,500,000	22,500,000		$ 27,500,000
Outstanding borrowings amount		10,600,000		$ 9,000,000
Long term debt		$ 10,600,000
Revolving Line of Credit [Member] | United States [Member]
Line of Credit Facility [Line Items]
Percentage of eligible accounts receivable		85.00%
Percentage of eligible unbilled accounts		60.00%
Revolving Line of Credit [Member] | Canada [Member]
Line of Credit Facility [Line Items]
Credit facility maximum borrowing capacity		$ 10,000,000
Percentage of eligible accounts receivable		85.00%
Percentage of eligible unbilled accounts		60.00%
Revolving Line of Credit [Member] | Line of Credit [Member]
Line of Credit Facility [Line Items]
Credit facility maximum borrowing capacity		$ 5,000,000
Revolving Line of Credit [Member] | Swing Loans [Member]
Line of Credit Facility [Line Items]
Credit facility maximum borrowing capacity	3,000,000	$ 5,000,000	$ 5,000,000		$ 3,000,000
Federal Funds Rate [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate		0.50%
PNC Bank, N.A. [Member]
Line of Credit Facility [Line Items]
Credit facility maximum borrowing capacity	65,000,000
Payment of deferred financing costs		$ 506,000
PNC Bank, N.A. [Member] | Term Loan Facility [Member]
Line of Credit Facility [Line Items]
Credit facility maximum borrowing capacity	30,500,000
PNC Bank, N.A. [Member] | Delayed Draw Term Loan [Member]
Line of Credit Facility [Line Items]
Credit facility maximum borrowing capacity	7,000,000
PNC Bank, N.A. [Member] | Revolving Line of Credit [Member]
Line of Credit Facility [Line Items]
Credit facility maximum borrowing capacity	27,500,000
Maximum [Member]
Line of Credit Facility [Line Items]
Revolving credit facility percentage margin over base rate		1.25%
Term loan percentage margin over base rate		2.50%
Revolving credit facility percentage margin adjusted LIBOR rate		2.25%
Term loan percentage margin adjusted LIBOR rate		3.50%
Commitment fee		0.30%
Maximum [Member] | PNC Bank, N.A. [Member] | Revolving Line of Credit [Member]
Line of Credit Facility [Line Items]
Credit facility additional borrowing capacity upon certain conditions	$ 10,000,000
Minimum [Member]
Line of Credit Facility [Line Items]
Revolving credit facility percentage margin over base rate		0.50%
Term loan percentage margin over base rate		1.75%
Revolving credit facility percentage margin adjusted LIBOR rate		1.50%
Term loan percentage margin adjusted LIBOR rate		2.75%
Commitment fee		0.20%