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
Balance (in shares) at Dec. 31, 2018		17,878,000				1,708,000
Balance at Dec. 31, 2018	$ 45,946	$ 357	$ 50,251	$ 5,427	$ (4,253)	$ (5,836)
Net loss	(2,729)			(2,729)
Issuance of common stock upon the exercise of stock options (in shares)		78,000
Issuance of common stock upon the exercise of stock options	30		30
Stock-based compensation	248		248
Foreign currency translation adjustments	(10)				(10)
Balance (in shares) at Mar. 31, 2019		17,956,000				1,708,000
Balance at Mar. 31, 2019	43,485	$ 357	50,529	2,698	(4,263)	$ (5,836)
Balance (in shares) at Dec. 31, 2018		17,878,000				1,708,000
Balance at Dec. 31, 2018	45,946	$ 357	50,251	5,427	(4,253)	$ (5,836)
Net loss	(3,838)
Foreign currency translation adjustments	121
Balance (in shares) at Jun. 30, 2019		18,035,000				1,708,000
Balance at Jun. 30, 2019	55,787	$ 360	63,806	1,589	(4,132)	$ (5,836)
Balance (in shares) at Mar. 31, 2019		17,956,000				1,708,000
Balance at Mar. 31, 2019	43,485	$ 357	50,529	2,698	(4,263)	$ (5,836)
Net loss	(1,109)			(1,109)
Issuance of common stock upon the exercise of stock options (in shares)		79,000
Issuance of common stock upon the exercise of stock options	213	$ 3	210
Stock-based compensation	602		602
Foreign currency translation adjustments	131				131
Convertible notes conversion discount	12,465		12,465
Balance (in shares) at Jun. 30, 2019		18,035,000				1,708,000
Balance at Jun. 30, 2019	$ 55,787	$ 360	63,806	1,589	(4,132)	$ (5,836)
Balance (in shares) at Dec. 31, 2019	16,629,177	18,360,000				1,731,000
Balance at Dec. 31, 2019	$ 72,847	$ 367	94,372	(10,144)	(5,368)	$ (6,380)
Net loss	(10,910)			(10,910)
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
Net issuance of restricted stock awards	0
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)
Acquisition consideration (in shares)		908,000
Issuance of restricted stock for acquisition	19	$ 19
Equity component of redeemed 2024 convertible notes, net of deferred taxes and issuance costs	(5,553)		(7,988)			$ 2,435
Equity component of issued 2026 convertible notes, net of deferred taxes and issuance costs shares (in shares)						(722,000)
Equity component of issued 2026 convertible notes, net of deferred taxes and issuance costs	19,097		19,097
Stock-based compensation	1,089		1,089
Foreign currency translation adjustments	201				201
Balance (in shares) at Mar. 31, 2020		19,291,000				1,047,000
Balance at Mar. 31, 2020	$ 76,296	$ 386	106,600	(21,054)	(5,167)	$ (4,469)
Balance (in shares) at Dec. 31, 2019	16,629,177	18,360,000				1,731,000
Balance at Dec. 31, 2019	$ 72,847	$ 367	94,372	(10,144)	(5,368)	$ (6,380)
Net loss	$ (19,886)
Issuance of common stock upon the exercise of stock options (in shares)	6,000
Foreign currency translation adjustments	$ 359
Balance (in shares) at Jun. 30, 2020	18,245,225	19,295,000				1,050,000
Balance at Jun. 30, 2020	$ 68,610	$ 386	107,540	(30,030)	(5,009)	$ (4,277)
Balance (in shares) at Mar. 31, 2020		19,291,000				1,047,000
Balance at Mar. 31, 2020	76,296	$ 386	106,600	(21,054)	(5,167)	$ (4,469)
Net loss	(8,976)			(8,976)
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
Balance (in shares) at Jun. 30, 2020	18,245,225	19,295,000				1,050,000
Balance at Jun. 30, 2020	$ 68,610	$ 386	$ 107,540	$ (30,030)	$ (5,009)	$ (4,277)