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		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Accounting Policies [Abstract]
Securities excluded from net loss per share calculation (in shares)	28	87	66	83
Numerator:
Net loss	$ (2,254)	$ (1,804)	$ (5,119)	$ (4,194)
Weighted Average Number of Shares Outstanding, Basic	12,336	11,949
Denominator:
Basic and diluted (in shares)	12,336	11,949	12,231	11,925
Potential common shares from equity awards and warrants (in shares)	0	0	0	0
Diluted weighted average shares (in shares)	12,336	11,949	12,231	11,925