Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock [Member]	Total
BALANCES (in shares) at Dec. 31, 2017	35,132,548				0
BALANCES at Dec. 31, 2017	$ 35	$ 312,783	$ (195,991)	$ 76	$ 0	$ 116,903
Exercise of options to purchase common stock (in shares)	349,464				0
Exercise of options to purchase common stock	$ 0	3,325	0	0	$ 0	3,325
Issuance of restricted stock units (in shares)	74,583				0
Issuance of restricted stock units	$ 0	0	0	0	$ (256)	(256)
Share-based compensation expense	0	6,971	0	0	0	6,971
Foreign Currency Translation	0	0	0	(108)	0	(108)
Net income (loss)	$ 0	0	(5,361)	0	$ 0	(5,361)
BALANCES (in shares) at Dec. 31, 2018	35,556,595				14,169
BALANCES at Dec. 31, 2018	$ 35	323,080	(201,353)	(32)	$ (256)	121,474
Exercise of options to purchase common stock (in shares)	513,540				0
Exercise of options to purchase common stock	$ 1	4,460	0	0	$ 0	4,460
Issuance of restricted stock units (in shares)	92,298				0
Issuance of restricted stock units	$ 0	(1,295)	0	0	$ 0	(1,295)
Share-based compensation expense	0	8,055	0	0	0	8,055
Foreign Currency Translation	0	0	0	(47)	0	(48)
Net income (loss)	$ 0	0	(1,383)	0	$ 0	(1,383)
BALANCES (in shares) at Dec. 31, 2019	36,162,433				14,169
BALANCES at Dec. 31, 2019	$ 36	334,299	(202,735)	(79)	$ (256)	131,265
Exercise of options to purchase common stock (in shares)	478,844				0
Exercise of options to purchase common stock	$ 0	5,441	0	0	$ 0	5,441
Issuance of restricted stock units (in shares)	91,133				0
Issuance of restricted stock units	$ 0	(2,568)	0	0	$ 0	(2,568)
Share-based compensation expense	0	11,157	0	0	0	11,157
Foreign Currency Translation	0	0	0	(1)	0	(1)
Net income (loss)	$ 0	0	(3,188)	0	$ 0	(3,188)
Shares issued in primary offering (in shares)	3,999,999				0
Shares issued in primary offering	$ 4	252,058	0	0	$ 0	252,062
BALANCES (in shares) at Dec. 31, 2020	40,732,409				14,169
BALANCES at Dec. 31, 2020	$ 41	$ 600,388	$ (205,924)	$ (80)	$ (256)	$ 394,169