Debt - Narrative (Details) - USD ($)			3 Months Ended	6 Months Ended
	Jan. 26, 2018	Jul. 31, 2017	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Debt Instrument [Line Items]
Total borrowings			$ 0	$ 0		$ 1,800,000
Common stock, par value (in dollars per share)		$ 0.0001	$ 0.0001	$ 0.0001		$ 0.0001
Unamortized debt discount			$ 0	$ 0		$ 269,000
Amortization of debt discount				104,000	$ 0
Western Alliance Bank A/R Revolver
Debt Instrument [Line Items]
Total current borrowing capacity (up to)		$ 1,500,000
Total borrowings			0	$ 0		800,000
Bridge Bank Loan Agreement Non-Formula Borrowings | Prime Rate
Debt Instrument [Line Items]
Basis spread on variable rate				2.25%
Western Alliance Bank And Super G Capital
Debt Instrument [Line Items]
Unamortized debt discount	$ 339,000		0	$ 0
Debt issuance costs	174,000
Warrants issued	165,000
Amortization of debt discount			269,000	269,000
Super G Capital
Debt Instrument [Line Items]
Proceeds from issuance of debt		1,100,000
Total borrowings	1,434,000		$ 0	$ 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)		550,000
Exercise price for outstanding warrants (in dollars per share)		$ 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]
Warrants exercised (in shares)				0
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