Liquidity and Going Concern - Narrative (Details) - USD ($)		1 Months Ended	3 Months Ended		6 Months Ended
	Jan. 25, 2018	Oct. 31, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Line of Credit Facility [Line Items]
Cash			$ 2,678,000	$ 1,097,000	$ 2,678,000	$ 1,097,000	$ 3,946,000	$ 1,140,000
Working capital			3,744,000		3,744,000
Debt			0		0		1,563,000
Net loss			1,689,000	$ 590,000	2,974,000	1,258,000
Net cash used in operating activities					689,000	(29,000)
Cash paid for interest payments on then-existing indebtedness					318,000	542,000
Outstanding principal, debt obligations			$ 0		0		$ 1,800,000
Issuance of preferred stock, net of expenses					1,527,000
Principal payment made					1,832,000	$ 0
Western Alliance Bank
Line of Credit Facility [Line Items]
Principal payment made					$ 800,000
Preferred Stock | Series C Preferred Stock
Line of Credit Facility [Line Items]
Issuance of stock (in shares)	1,750				1,750
Dividend rate, percentage	0.00%
Issuance of preferred stock, net of expenses	$ 1,527,000
Preferred Stock | Series B Preferred Stock
Line of Credit Facility [Line Items]
Issuance of stock (in shares)		2,800
Dividend rate, percentage					0.00%