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 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, 2018	182,596	$ 215	183,290	(909)
Balance, shares at Dec. 31, 2018		29,545
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(87,443)
Unrealized gain (loss) on marketable securities, net of income tax benefit	6
Foreign currency translation adjustment, including income tax expense (benefit)	200
Balance, shares at Jun. 30, 2019		29,728
Ending balance at Jun. 30, 2019	94,916	$ 213	95,629	(926)
Beginning balance at Mar. 31, 2019	173,631	$ 0	174,497	(866)
Balance, shares at Mar. 31, 2019		29,593
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(78,868)		(78,868)
Unrealized gain (loss) on marketable securities, net of income tax benefit	(9)			(9)
Gain (loss) on derivative securities, effective portion, net of income tax expense	(123)			(123)
Foreign currency translation adjustment, including income tax expense (benefit)	72			72
Stock-based compensation expense	9	$ 9	0
Common stock issued under equity compensation plan, shares		87
Common stock issued under equity compensation plan, net of shares withheld for tax payments	36	$ 36
Common stock issued under employee stock purchase plan, shares		48
Common stock issued under employee stock purchase plan	168	$ 168
Balance, shares at Jun. 30, 2019		29,728
Ending balance at Jun. 30, 2019	94,916	$ 213	95,629	(926)
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 loss	2,184		2,184
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)
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 loss	(2,926)
Unrealized gain (loss) on marketable securities, net of income tax benefit	0
Foreign currency translation adjustment, including income tax expense (benefit)	(22)
Balance, shares at Jun. 30, 2020		29,967
Ending balance at Jun. 30, 2020	89,116	$ 2,729	87,346	(959)
Beginning balance at Mar. 31, 2020	92,925	$ 1,781	92,456	(1,312)
Balance, shares at Mar. 31, 2020		29,817
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(5,110)		(5,110)
Unrealized gain (loss) on marketable securities, net of income tax benefit	0
Foreign currency translation adjustment, including income tax expense (benefit)	353			353
Stock-based compensation expense	865	$ 865	0
Common stock issued under equity compensation plan, shares		87
Common stock issued under equity compensation plan, net of shares withheld for tax payments	0
Common stock issued under employee stock purchase plan, shares		63
Common stock issued under employee stock purchase plan	83	$ 83
Balance, shares at Jun. 30, 2020		29,967
Ending balance at Jun. 30, 2020	$ 89,116	$ 2,729	$ 87,346	$ (959)