CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Preferred Stock	Common stock	Treasury Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income	Non-Controlling Interest
Beginning balance (in shares) at Dec. 31, 2016		1	50,698,587
Beginning balance at Dec. 31, 2016	$ 335,145	$ 0	$ 5	$ (3,885)	$ 475,598	$ (132,200)	$ (4,373)	$ 0
Increase (Decrease) in Stockholders' Equity [Abstract]
Stock-based compensation	1,886				1,886
Transfer of director compensation from liability to equity	442				442
Issuance of stock, net of forfeitures (in shares)			303,647
Settlement of Dow liabilities, net of tax	55,089				55,089
Purchase of non-controlling interest	8,352							8,352
Comprehensive loss	15,166					23,471	(8,396)	91
Ending balance (in shares) at Dec. 31, 2017		1	51,002,234
Ending balance at Dec. 31, 2017	416,080	$ 0	$ 5	(3,885)	533,015	(108,729)	(12,769)	8,443
Increase (Decrease) in Stockholders' Equity [Abstract]
Stock-based compensation	2,804				2,804
Issuance of stock, net of forfeitures (in shares)			69,339
Comprehensive loss	(46,308)					(30,060)	(16,068)	(180)
Ending balance (in shares) at Dec. 31, 2018		1	51,071,573
Ending balance at Dec. 31, 2018	372,576	$ 0	$ 5	(3,885)	535,819	(138,789)	(28,837)	8,263
Increase (Decrease) in Stockholders' Equity [Abstract]
Stock-based compensation	2,934				2,934
Issuance of stock, net of forfeitures (in shares)			599,281
Issuance of common stock under employee stock purchase plan (in shares)			168,673
Issuance of common stock under employee stock purchase plan	241				241
Settlement of Dow liabilities, net of tax	22,012				22,012
Comprehensive loss	(63,733)					(60,832)	(2,223)	(678)
Ending balance (in shares) at Dec. 31, 2019		1	51,839,527
Ending balance at Dec. 31, 2019	$ 334,030	$ 0	$ 5	$ (3,885)	$ 561,006	$ (199,621)	$ (31,060)	$ 7,585