CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid in Capital	Accumulated deficit	Accumulated Other Comprehensive Loss	Treasury Stock
Beginning Balance (in shares) at Dec. 31, 2019		18,360,000				1,731,000
Beginning Balance at Dec. 31, 2019	$ 72,847	$ 367	$ 94,372	$ (10,144)	$ (5,368)	$ (6,380)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon the exercise of stock options (in shares)		2,000
Issuance of common stock upon the exercise of stock options	30		30
Net issuance of restricted stock awards (in shares)		21,000
Treasury stock acquired from employees upon vesting or forfeiture of restricted stock (in shares)						38,000
Treasury stock acquired from employees upon vesting or forfeiture of restricted stock	(524)					$ (524)
Issuance of restricted stock for acquisition (in shares)		908,000
Issuance of restricted stock for acquisition	19	$ 19
Equity component of redeemed 2024 convertible notes (in shares)						(722,000)
Equity component of redeemed 2024 convertible notes	(5,553)		(7,988)			$ 2,435
Equity component of issued 2026 convertible notes	19,097		19,097
Stock-based compensation	1,089		1,089
Foreign currency translation adjustments	201				201
Net loss	(10,910)			(10,910)
Ending Balance (in shares) at Mar. 31, 2020		19,291,000				1,047,000
Ending Balance at Mar. 31, 2020	76,296	$ 386	106,600	(21,054)	(5,167)	$ (4,469)
Beginning Balance (in shares) at Dec. 31, 2019		18,360,000				1,731,000
Beginning Balance at Dec. 31, 2019	72,847	$ 367	94,372	(10,144)	(5,368)	$ (6,380)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Foreign currency translation adjustments	359
Net loss	(19,886)
Ending Balance (in shares) at Jun. 30, 2020		19,295,000				1,050,000
Ending Balance at Jun. 30, 2020	68,610	$ 386	107,540	(30,030)	(5,009)	$ (4,277)
Beginning Balance (in shares) at Mar. 31, 2020		19,291,000				1,047,000
Beginning Balance at Mar. 31, 2020	76,296	$ 386	106,600	(21,054)	(5,167)	$ (4,469)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon the exercise of stock options (in shares)		4,000
Issuance of common stock upon the exercise of stock options	12		12
Treasury stock acquired from employees upon vesting or forfeiture of restricted stock (in shares)						3,000
Treasury stock acquired from employees upon vesting or forfeiture of restricted stock	(3)		(195)			$ 192
Stock-based compensation	1,123		1,123
Foreign currency translation adjustments	158				158
Net loss	(8,976)			(8,976)
Ending Balance (in shares) at Jun. 30, 2020		19,295,000				1,050,000
Ending Balance at Jun. 30, 2020	$ 68,610	$ 386	107,540	(30,030)	(5,009)	$ (4,277)
Beginning Balance (in shares) at Dec. 31, 2020	21,917,357	22,983,000				1,066,000
Beginning Balance at Dec. 31, 2020	$ 188,405	$ 459	243,575	(46,706)	(3,936)	$ (4,987)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon the exercise of stock options (in shares)		34,000
Issuance of common stock upon the exercise of stock options	409	$ 1	408
Net issuance of restricted stock awards (in shares)		87,000
Net issuance of restricted stock awards	265	$ 2	263
Treasury stock acquired from employees upon vesting or forfeiture of restricted stock (in shares)						76,000
Treasury stock acquired from employees upon vesting or forfeiture of restricted stock	(3,974)					$ (3,974)
Stock-based compensation	1,320		1,320
Foreign currency translation adjustments	(302)				(302)
Net loss	(8,271)			(8,271)
Ending Balance (in shares) at Mar. 31, 2021		23,104,000				1,142,000
Ending Balance at Mar. 31, 2021	$ 177,852	$ 462	245,566	(54,977)	(4,238)	$ (8,961)
Beginning Balance (in shares) at Dec. 31, 2020	21,917,357	22,983,000				1,066,000
Beginning Balance at Dec. 31, 2020	$ 188,405	$ 459	243,575	(46,706)	(3,936)	$ (4,987)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon the exercise of stock options (in shares)	54,000
Foreign currency translation adjustments	$ 53
Net loss	$ (18,227)
Ending Balance (in shares) at Jun. 30, 2021	25,848,889	26,998,000				1,149,000
Ending Balance at Jun. 30, 2021	$ 436,561	$ 540	514,295	(64,933)	(3,883)	$ (9,458)
Beginning Balance (in shares) at Mar. 31, 2021		23,104,000				1,142,000
Beginning Balance at Mar. 31, 2021	177,852	$ 462	245,566	(54,977)	(4,238)	$ (8,961)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon the exercise of stock options (in shares)		20,000
Issuance of common stock upon the exercise of stock options	209		209
Net issuance of restricted stock awards (in shares)		28,000
Net issuance of restricted stock awards	1	$ 1
Treasury stock acquired from employees upon vesting or forfeiture of restricted stock (in shares)						7,000
Treasury stock acquired from employees upon vesting or forfeiture of restricted stock	(497)					$ (497)
Issuance of restricted stock for acquisition (in shares)		1,493,000
Issuance of restricted stock for acquisition	108,659	$ 30	108,629
Issuance of common stock (in shares)		2,353,000
Issuance of common stock	155,687	$ 47	155,640
Stock-based compensation	4,251		4,251
Foreign currency translation adjustments	355				355
Net loss	$ (9,956)			(9,956)
Ending Balance (in shares) at Jun. 30, 2021	25,848,889	26,998,000				1,149,000
Ending Balance at Jun. 30, 2021	$ 436,561	$ 540	$ 514,295	$ (64,933)	$ (3,883)	$ (9,458)