Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balances (in shares) at Dec. 31, 2017	5,729
Balances at Dec. 31, 2017	$ 6	$ 291,163	$ (227,704)	$ (682)	$ 62,783
Impact of adoption of Accounting Standards Codification 606 on January 1, 2018 at Dec. 31, 2017			4,235		4,235
Issuance of common stock from vesting of restricted stock units (in shares)	19
Issuance of common stock from vesting of restricted stock units
Tax withholding related to vesting of restricted stock units		(96)			(96)
Stock-based compensation expense		1,028			1,028
Net loss			(9,112)		(9,112)
Foreign currency translation adjustments and other		4		444	448
Balances (in shares) at Mar. 31, 2018	5,748
Balances at Mar. 31, 2018	$ 6	292,099	(232,581)	(238)	59,286
Balances (in shares) at Dec. 31, 2017	5,729
Balances at Dec. 31, 2017	$ 6	291,163	(227,704)	(682)	62,783
Impact of adoption of Accounting Standards Codification 606 on January 1, 2018 at Dec. 31, 2017			4,235		4,235
Net loss					(41,244)
Balances (in shares) at Dec. 31, 2018	5,938
Balances at Dec. 31, 2018	$ 6	295,116	(264,713)	(1,038)	29,371	[1]
Issuance of common stock from vesting of restricted stock units (in shares)	16
Issuance of common stock from vesting of restricted stock units
Tax withholding related to vesting of restricted stock units		(56)			(56)
Stock-based compensation expense		685			685
Net loss			(4,606)		(4,606)
Foreign currency translation adjustments and other				(71)	(71)
Balances (in shares) at Mar. 31, 2019	5,954
Balances at Mar. 31, 2019	$ 6	$ 295,745	$ (269,319)	$ (1,109)	$ 25,323

[1] Derived from the Company's audited consolidated financial statements as of December 31, 2018.