Liquidity and Going Concern - Narrative (Details) - USD ($)		3 Months Ended		9 Months Ended
	Jan. 25, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Line of Credit Facility [Line Items]
Cash		$ 2,578,000	$ 1,439,000	$ 2,578,000	$ 1,439,000	$ 3,946,000	$ 1,140,000
Working capital		3,355,000		3,355,000
Debt		0		0		1,563,000
Net loss		1,470,000	$ (7,104,000)	4,444,000	(5,846,000)
Net cash used in operating activities				609,000	(1,073,000)
Cash paid during the period for interest				318,000	777,000
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	$ 341,000
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