Income Taxes - Components of Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019
Deferred tax assets:
Accrued expenses	$ 850	$ 231
Allowance for doubtful accounts	81	64
Intangibles	987	1,186
Goodwill	4,257	3,613
Startup costs	101	112
Deferred rent	0	184
Percentage of completion	105	67
Stock-based compensation	679	566
Net operating losses and credits	841	1,434
Interest	507	289
Lease liabilities	5,960	0
Other	176	40
Total deferred tax assets	14,544	7,786
Deferred tax liabilities:
Fixed assets	(3,897)	(3,610)
Right-of-use assets	(5,586)	0
Debt discounts	(275)	0
Total deferred tax liabilities	(9,758)	(3,610)
Net deferred tax asset	$ 4,786	$ 4,176