Debt - Western Alliance Bank Business Financing Agreement (Details)		12 Months Ended
	Jul. 31, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Proceeds from issuance of debt	$ 2,200,000
Long-term debt		$ 0	$ 1,832,000
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
Repayments of debt		800,000	300,000
Long-term debt		$ 0	$ 800,000
Bridge Bank Loan Agreement Non-Formula Borrowings
Debt Instrument [Line Items]
Current borrowing capacity	400,000
Debt periodic payment two	200,000
Debt periodic payment three	0
Debt variable rate		4.75%
Debt interest rate during period		7.00%
Proceeds from issuance of debt	$ 600,000
Bridge Bank Loan Agreement Non-Formula Borrowings | Prime Rate
Debt Instrument [Line Items]
Debt basis spread on variable rate	2.25%
Debt basis spread on variable rate floor	4.00%
Western Alliance Bank Loan Agreement
Debt Instrument [Line Items]
Proceeds from issuance of debt	$ 1,100,000