Subsequent Event (Details) - USD ($) $ / shares in Units, $ in Thousands						12 Months Ended
	Feb. 16, 2021	Jan. 01, 2021	Mar. 12, 2019	Jan. 18, 2019	Jan. 14, 2019	Dec. 31, 2020	Dec. 31, 2019
Subsequent Event [Line Items]
Gross proceeds			$ 17,000	$ 1,500	$ 900	$ 4,289	$ 26,700
Stock issued							409,875
Net proceeds from warrants							$ 1,100
Subsequent Event [Member]
Subsequent Event [Line Items]
Stock issued		416,655
Weighted average exercise price		$ 9.9
Net proceeds from warrants		$ 4,100
Subsequent Event [Member] | At-The-Market Offering Agreement [Member]
Subsequent Event [Line Items]
Shares issued (in shares)		278,800
Gross proceeds		$ 2,300
Net proceeds		$ 2,200
Subsequent Event [Member] | 2021 Registered Direct Offering
Subsequent Event [Line Items]
Gross proceeds	$ 13,000
Net proceeds	$ 12,200
Subsequent Event [Member] | Placement agency agreement with Roth Capital Partners, LLC
Subsequent Event [Line Items]
Shares issued (in shares)	1,710,600
Subsequent Event [Member] | Securities purchase agreement
Subsequent Event [Line Items]
Shares issued (in shares)	1,650,000