Long-term Debt - Series C Narrative (Details) - $ / shares	1 Months Ended
	Jul. 31, 2017	Oct. 31, 2015	Dec. 31, 2019	Dec. 31, 2018
Preferred Stock Warrants
Class of Stock [Line Items]
Warrants outstanding (in shares)		163,877	0	2,672,502
Series C
Class of Stock [Line Items]
Temporary equity, shares issued (in shares)	163,877	327,759
Stock issued, price per share (in USD per share)	$ 6.11	$ 6.11