Debt - Western Alliance Bank Business Financing Agreement (Details)					12 Months Ended
	Apr. 01, 2018 USD ($)	Mar. 05, 2018	Jan. 02, 2018 USD ($)	Jul. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Proceeds from issuance of debt				$ 2,200,000
Principal payments under borrowing arrangements					$ 605,000	$ 400,000
Long-term debt					1,832,000
Subsequent Event
Debt Instrument [Line Items]
Principal payments under borrowing arrangements			$ 200,000
Western Alliance Bank A/R Revolver
Debt Instrument [Line Items]
Current borrowing capacity				$ 1,500,000
Borrowing base of eligible accounts receivable				0.85
Proceeds from issuance of debt				$ 500,000
Principal payments under borrowing arrangements					100,000
Long-term debt					800,000	$ 0
Unused borrowing capacity amount					200,000
Bridge Bank Loan Agreement Non-Formula Borrowings
Debt Instrument [Line Items]
Current borrowing capacity				600,000
Debt periodic payment one				400,000
Debt periodic payment two				200,000
Debt periodic payment three				0
Proceeds from issuance of debt				$ 600,000
Principal payments under borrowing arrangements					$ 200,000
Debt variable rate					4.50%
Debt interest rate during period					6.25%
Long-term debt					$ 400,000
Bridge Bank Loan Agreement Non-Formula Borrowings | Scenario, Forecast
Debt Instrument [Line Items]
Principal payments under borrowing arrangements	$ 200,000
Bridge Bank Loan Agreement Non-Formula Borrowings | Subsequent Event
Debt Instrument [Line Items]
Principal payments under borrowing arrangements			$ 200,000
Debt variable rate		4.50%
Debt interest rate during period		6.75%
Bridge Bank Loan Agreement Non-Formula Borrowings | Prime Rate
Debt Instrument [Line Items]
Debt basis spread on variable rate				1.75%
Debt basis spread on variable rate floor				4.00%
Bridge Bank Loan Agreement Non-Formula Borrowings | Prime Rate | Subsequent Event
Debt Instrument [Line Items]
Debt basis spread on variable rate		2.25%
Western Alliance Bank Loan Agreement
Debt Instrument [Line Items]
Proceeds from issuance of debt				$ 1,100,000