Equity - EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Numerator
Net loss attributable to Solaris	$ (1,211)	$ (5,540)	$ (2,380)	$ (24,623)
Loss attributable to participating securities	(100)		(200)
Net loss attributable to common stockholders	$ (1,300)	$ (5,500)	$ (2,600)	$ (24,600)
Class A Common Stock
Denominator
Weighted average number of unrestricted outstanding common shares used to calculate basic net loss per share (in shares)	30,984	28,638	30,473	28,975
Diluted weighted-average shares of Class A common stock outstanding used to calculate diluted net loss per share (in shares)	30,984	28,638	30,473	28,975
Loss per share of Class A common stock - basic (in dollars per share)	$ (0.04)	$ (0.20)	$ (0.08)	$ (0.85)
Loss per share of Class A common stock - diluted (in dollars per share)	$ (0.04)	$ (0.20)	$ (0.08)	$ (0.85)