Debt - Narrative (Details)			3 Months Ended
	Jan. 26, 2018 USD ($)	Jul. 31, 2017 USD ($) $ / shares shares	Mar. 31, 2018 USD ($) shares	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Principal payment made			$ 1,832,000	$ 0
Total borrowings			0		$ 1,800,000
Long-term debt			0		1,563,000
Unamortized debt discount			0		269,000
Amortization of debt discount			$ 104,000	$ 18,000
Warrant
Debt Instrument [Line Items]
Warrants exercised (in shares) | shares			0
Western Alliance Bank A/R Revolver
Debt Instrument [Line Items]
Total current borrowing capacity (up to)		$ 1,500,000
Borrowing base of eligible accounts receivable		0.85
Proceeds from issuance of debt		$ 500,000
Principal payment made			$ 800,000
Total borrowings			0		800,000
Additional availability			$ 764,000
Bridge Bank Loan Agreement Non-Formula Borrowings
Debt Instrument [Line Items]
Total current borrowing capacity (up to)					400,000
Installment payment due January 1, 2018		200,000
Installment payment due April 1, 2018		0
Variable rate			4.75%
Interest rate during the period			7.00%
Proceeds from issuance of debt		$ 600,000
Total borrowings			$ 400,000
Bridge Bank Loan Agreement Non-Formula Borrowings | Prime Rate
Debt Instrument [Line Items]
Basis spread on variable rate			2.25%
Prime rate, floor		4.00%
Western Alliance Bank And Super G Capital
Debt Instrument [Line Items]
Unamortized debt discount	$ 339,000		$ 0
Debt issuance costs	174,000
Warrants issued	165,000
Amortization of debt discount			269,000
Super G Capital
Debt Instrument [Line Items]
Proceeds from issuance of debt		$ 1,100,000
Total borrowings	1,434,000		0		1,032,000
Monthly installment payment for first three months following closing		33,000
Monthly installment payment for months four through twenty-four		68,600
Total payments		$ 1,540,000
Effective interest rate		33.00%
Warrants issued (in shares) | shares		550,000
Exercise price for outstanding warrants (in dollars per share) | $ / shares		$ 0.30
Warrants, term period		3 years
Warrant, profit over the term, or cash exit fee implemented (at least)		$ 165,000
Repayments of debt, total cash payments	1,269,000
Gain on debt extinguishment	$ 165,000
Super G Capital | Warrant
Debt Instrument [Line Items]
Fair value of warrant recorded as derivative liability					$ 165,000
Western Alliance Bank
Debt Instrument [Line Items]
Proceeds from issuance of debt		$ 1,100,000
Principal payment made			$ 800,000