Basis of Presentation and Summary of Significant Accounting Policies - Reconciliation of Basic and Diluted Loss per Share (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator:
Net loss	$ (1,920)	$ (1,773)	$ (6,114)	$ (9,409)
Denominator:
Basic weighted average common shares outstanding (in shares)	12,059	11,856
Weighted Average Number of Shares Outstanding, Basic and Diluted	12,059	11,856	11,970	11,789
Potential common shares from equity awards and warrants (in shares)	0		0	0
Diluted weighted average shares (in shares)	12,059	11,856	11,970	11,789