CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Previously Reported	Traditional Common Stock	Traditional Common Stock Previously Reported	Additional Paid-in Capital	Additional Paid-in Capital Previously Reported	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Previously Reported	Accumulated Deficit	Accumulated Deficit Previously Reported
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adoption of accounting standards	$ 2,634								$ 2,634
Beginning balance at Dec. 31, 2017	103,074	$ 100,440	$ 73	$ 73	$ 243,598	$ 243,598	$ 232	$ 232	(140,829)	$ (143,463)
Beginning balance (in shares) at Dec. 31, 2017			7,303	7,303
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income after equity in losses of unconsolidated affiliates	2,155								2,155
Issuance of common stock, net of shares withheld for employee taxes	(1,284)		$ 1		(1,285)
Issuance of common stock, net of shares withheld for employee taxes (in shares)			116
Stock-based compensation	1,064				1,064
Other comprehensive income (loss)	81						81
Ending balance at Mar. 31, 2018	105,090		$ 74		243,377		313		(138,674)
Ending balance (in shares) at Mar. 31, 2018			7,419
Beginning balance at Dec. 31, 2018	122,409		$ 77		257,034		277		(134,979)
Beginning balance (in shares) at Dec. 31, 2018			7,676
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income after equity in losses of unconsolidated affiliates	814								814
Issuance of common stock, net of shares withheld for employee taxes	(3,070)		$ 0		(3,070)
Issuance of common stock, net of shares withheld for employee taxes (in shares)			71
Stock-based compensation	1,186				1,186
Other comprehensive income (loss)	(62)						(62)
Ending balance at Mar. 31, 2019	$ 121,277		$ 77		$ 255,150		$ 215		$ (134,165)
Ending balance (in shares) at Mar. 31, 2019			7,747