Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Numerator:
Net loss - basic	$ (2,840)	$ (2,044)
Change in fair value of Initial Warrant liability	(5,205)	0
Net loss - diluted	$ (8,045)	$ (2,044)
Denominator:
Weighted average shares outstanding (in shares)	52,139	51,830
Issuance of warrants (in shares)	1,335	0
Weighted average shares outstanding - basic and diluted (in shares)	53,474	51,830
Basic loss per share (in dollars per share)	$ (0.05)	$ (0.04)
Diluted loss per share (in dollars per share)	$ (0.15)	$ (0.04)