CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS’ EQUITY - USD ($)	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss
Balance (in shares) at Dec. 31, 2018		74,697,526
Balance at Dec. 31, 2018	$ 197,221,000	$ 75,000	$ 419,456,000	$ (220,276,000)	$ (2,034,000)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation expense	2,425,000		2,425,000
Exercise of stock options (in shares)		151,737
Exercise of stock options	681,000		681,000
Issuance of common stock for vested RSAs (in shares)		420,772
Issuance of common stock for vested restricted stock awards	0	$ 1,000	(1,000)
Restricted stock awards withheld to cover taxes	(89,000)		(89,000)
Other comprehensive loss	(269,000)				(269,000)
Net (loss) income	1,258,000			1,258,000
Balance (in shares) at Mar. 31, 2019		75,270,035
Balance at Mar. 31, 2019	201,227,000	$ 76,000	422,472,000	(219,018,000)	(2,303,000)
Balance (in shares) at Dec. 31, 2019		70,756,013
Balance at Dec. 31, 2019	197,240,000	$ 71,000	430,959,000	(231,441,000)	(2,349,000)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation expense	$ 3,185,000		3,185,000
Exercise of stock options (in shares)	162,841	162,841
Exercise of stock options	$ 564,000		564,000
Issuance of common stock for vested RSAs (in shares)		279,573
Issuance of common stock for vested restricted stock awards	0
Restricted stock awards withheld to cover taxes	(86,000)		(86,000)
Repurchase and retirement of common stock (in shares)		(12,935)
Repurchase and retirement of common stock	(65,000)			(65,000)
Other comprehensive loss	(182,000)				(182,000)
Net (loss) income	(2,408,000)			(2,408,000)
Balance (in shares) at Mar. 31, 2020		71,185,492
Balance at Mar. 31, 2020	$ 198,089,000	$ 71,000	$ 434,622,000	$ (234,073,000)	$ (2,531,000)