Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2018	$ 182,596	$ 215	$ 183,290	$ (909)
Balance, shares at Dec. 31, 2018		29,545
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(8,575)		(8,575)
Unrealized gain (loss) on marketable securities, net of income tax benefit	15			15
Gain (loss) on derivative securities, effective portion, net of income tax expense	(100)			(100)
Foreign currency translation adjustment, including income tax expense (benefit)	128			128
Stock-based compensation expense	(365)	$ (147)	(218)
Common stock issued under equity compensation plan, shares		48
Common stock issued under equity compensation plan, net of shares withheld for tax payments	(68)	$ (68)
Balance, shares at Mar. 31, 2019		29,593
Ending balance at Mar. 31, 2019	173,631	$ 0	174,497	(866)
Beginning balance at Dec. 31, 2019	90,596	$ 1,261	90,272	(937)
Balance, shares at Dec. 31, 2019		29,781
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	2,184		2,184
Unrealized gain (loss) on marketable securities, net of income tax benefit	0
Gain (loss) on derivative securities, effective portion, net of income tax expense	0
Foreign currency translation adjustment, including income tax expense (benefit)	(375)			(375)
Stock-based compensation expense	564	$ 564	0
Common stock issued under equity compensation plan, shares		36
Common stock issued under equity compensation plan, net of shares withheld for tax payments	(44)	$ (44)
Balance, shares at Mar. 31, 2020		29,817
Ending balance at Mar. 31, 2020	$ 92,925	$ 1,781	$ 92,456	$ (1,312)