Condensed Consolidated Statements of Preferred Units and Stockholders' /Members' Equity/(Deficit) - USD ($) $ in Thousands	Total	Series A, B, C and D Common Units [Member]	Series 1 Senior Preferred Units [Member]	Redeemable Preferred Units [Member]	Series 2 Senior Preferred Units [Member]	Junior Preferred Units [Member]	Common Stock [Member]	Additional Paid In Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Members' Deficit [Member]	Accumulated Members' Deficit [Member] Series 1 Senior Preferred Units [Member]	Accumulated Members' Deficit [Member] Redeemable Preferred Units [Member]	Total Members' Deficit [Member]	Total Members' Deficit [Member] Series 1 Senior Preferred Units [Member]	Total Members' Deficit [Member] Redeemable Preferred Units [Member]	Noncontrolling Interest [Member]	Series B Common Units in exchange for Series A Common Units [Member] Series A, B, C and D Common Units [Member]	Series D Common Units in Exchange for Series A Common Units [Member] Series A, B, C and D Common Units [Member]	Series A Common Units in Exchange for Redeemable Preferred Units [Member]	Series A Common Units in Exchange for Redeemable Preferred Units [Member] Series A, B, C and D Common Units [Member]	Series A Common Units in Exchange for Redeemable Preferred Units [Member] Total Members' Deficit [Member]	Series D Common Units [Member]	Series D Common Units [Member] Series A, B, C and D Common Units [Member]	Series D Common Units [Member] Accumulated Members' Deficit [Member]	Series D Common Units [Member] Total Members' Deficit [Member]	Series D Common Units [Member] Noncontrolling Interest [Member]	Series C Common Units in Exchange for Class B Non-controlling Interest in Solid GT [Member] Series A, B, C and D Common Units [Member]	Series C Common Units in Exchange for Class B Non-controlling Interest in Solid GT [Member] Total Members' Deficit [Member]	Series C Common Units in Exchange for Class B Non-controlling Interest in Solid GT [Member] Noncontrolling Interest [Member]	Series D Common Units in Exchange for Class C Non-controlling Interest in Solid GT [Member] Series A, B, C and D Common Units [Member]	Series D Common Units in Exchange for Class C Non-controlling Interest in Solid GT [Member] Total Members' Deficit [Member]	Series D Common Units in Exchange for Class C Non-controlling Interest in Solid GT [Member] Noncontrolling Interest [Member]
Ending balance, units at Dec. 31, 2017			2,500,000		4,886,000	4,414,356
Ending balance, units at Dec. 31, 2017	19,438,552	19,438,552
Beginning balance at Dec. 31, 2016				$ 71,649
Redeemable Preferred Units
Conversion of units into shares of common stock, units																				12,219,299							1,635,916			1,083,205
Beginning balance, units at Dec. 31, 2016				17,100,000
Redeemable Preferred Units
Conversion of units into shares of common stock, value																			$ 55,964	$ 55,964	$ 55,964						$ 2,053	$ 2,053	$ (2,053)	$ 1,409	$ 1,409	$ (1,409)
Issuance of preferred units, value			$ 24,041		$ 55,002	$ 44,177
Issuance of preferred units, units			2,500,000		4,886,000	4,414,356
Accretion (decretion) in redemption value of preferred units			$ 959
Redemption of preferred units				$ (15,685)
Issuance of Series A common units in exchange for redeemable preferred units, units				(17,100,000)
Issuance of Series A common units in exchange for redeemable preferred units, value				$ (55,964)
Ending balance at Dec. 31, 2017			$ 25,000		$ 55,002	$ 44,177
Ending balance, units at Dec. 31, 2017			2,500,000		4,886,000	4,414,356
Members' Deficit
Conversion of units into shares of common stock, value																			$ 55,964	$ 55,964	$ 55,964						$ 2,053	$ 2,053	$ (2,053)	$ 1,409	$ 1,409	$ (1,409)
Conversion of units into shares of common stock, units																				12,219,299							1,635,916			1,083,205
Issuance of common stock upon initial public offering, net of offering cost, units																							838,689
Equity-based compensation	$ 5,330	$ 5,030											$ 5,030			$ 300
Net loss	(53,178)									$ (52,118)			(52,118)			(1,060)
Unrealized loss on available for sale securities	(36)								$ (36)				(36)
Ending balance at Dec. 31, 2017	(59,257)	65,014							(13)	(124,258)			(59,257)
Beginning balance at Dec. 31, 2016	$ (37,886)	$ 558							23	(84,941)			(84,360)			$ 46,474
Beginning balance, units at Dec. 31, 2016		5,123,917,000
Members' Deficit
Accretion (decretion) in redemption value of preferred units			$ (959)								$ (959)			$ (959)
Redemption of preferred units				$ 15,685								$ 15,685			$ 15,685
Issuance of common units in exchange for common units																	(1,301,520)	(160,954)
Issuance of junior preferred units in redemption of Class D non-controlling interest in Solid GT																						$ (44,177)		$ (1,925)	$ (1,925)	$ (42,252)
Ending balance, units at Dec. 31, 2017	19,438,552	19,438,552
Ending balance, units at Mar. 31, 2018			0		0	0
Ending balance, units at Mar. 31, 2018	0						35,476,892
Redeemable Preferred Units
Conversion of units into shares of common stock, units		(19,429,620)	(2,500,000)	0	(4,886,000)	(4,414,356)	26,498,559
Beginning balance, units at Dec. 31, 2017			2,500,000		4,886,000	4,414,356
Redeemable Preferred Units
Conversion of units into shares of common stock, value	$ 124,179	$ (65,180)	$ (25,000)		$ (55,002)	$ (44,177)	$ 26	$ 189,333					124,179
Ending balance, units at Mar. 31, 2018			0		0	0
Members' Deficit
Conversion of units into shares of common stock, value	124,179	$ (65,180)	$ (25,000)		$ (55,002)	$ (44,177)	$ 26	189,333					124,179
Conversion of units into shares of common stock, units		(19,429,620)	(2,500,000)	0	(4,886,000)	(4,414,356)	26,498,559
Issuance of common stock upon initial public issuance, net of issuance costs of $4,592	129,096						$ 9	129,087					129,096
Issuance of common stock upon initial public offering, net of offering cost, units							8,984,375
Equity-based compensation	819	$ 166						653					819
Net loss	(15,877)									(15,877)			(15,877)
Repurchase of common units/ shares of common stock		(8,932)					(6,042)
Unrealized loss on available for sale securities	(10)								(10)				(10)
Ending balance at Mar. 31, 2018	178,950						$ 35	$ 319,073	(23)	(140,135)			178,950
Beginning balance at Dec. 31, 2017	$ (59,257)	$ 65,014							$ (13)	$ (124,258)			$ (59,257)
Beginning balance, units at Dec. 31, 2017	19,438,552	19,438,552
Ending balance, units at Mar. 31, 2018	0						35,476,892