Debt - Summary of Debt (Parenthetical) (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total debt	$ 8,600	$ 17,200
Long term portion debt	$ 6,890	$ 17,056
CIBC loan due June 29, 2020, effective borrowing rate of 6.55% and 5.93% [Member] | Loan Agreement [Member]
Debt Instrument [Line Items]
Loan due date	Jun. 29, 2020
Effective rate of borrowing	6.55%	5.93%
Total debt	$ 8,400	$ 16,900
Long term portion debt	6,800
Current portion of debt	$ 1,600
Furniture loan due May 2021, effective borrowing rate of 9.10% [Member]
Debt Instrument [Line Items]
Effective rate of borrowing	9.10%
Loan due date	2021-05
Total debt	$ 100	100
Furniture loan due May 2021, effective borrowing rate of 9.55% [Member]
Debt Instrument [Line Items]
Effective rate of borrowing	9.55%
Loan due date	2021-05
Total debt	$ 100	100
Furniture loan due May 2021, effective borrowing rate of 9.55% [Member] | Maximum [Member]
Debt Instrument [Line Items]
Total debt	$ 100
Furniture loan due July 2019, effective borrowing rate of 13.98% [Member]
Debt Instrument [Line Items]
Effective rate of borrowing	13.98%
Loan due date	2019-07
Total debt		100
Furniture Loans [Member]
Debt Instrument [Line Items]
Total debt	$ 100	200
Current portion of debt	$ 100	$ 100