Elements of Deferred Income Tax Assets (Liabilities) (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred income tax assets (liabilities)
- Depreciation & amortization	$ (5,865)	$ (3,665)
- Reserves for doubtful accounts	159	115
- Inventory reserve	2,503	218
- Non qualified stock options	778	409
- Net operating losses	9,574	1,450
- Amt credit	86	0
- Deferred interest	3,637	0
- Valuation allowance	(11,315)	0
Total	$ (443)	$ (1,473)