CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid in Capital	Retained Earnings (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 income (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, 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 income (loss)	$ (10,910)			(10,910)
Issuance of common stock upon the exercise of stock options (in shares)	2,000	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)		0			$ (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 redeemed 2024 convertible notes, net of deferred taxes and issuance costs (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	18,244,350	19,291,000				1,047,000
Balance at Mar. 31, 2020	$ 76,296	$ 386	$ 106,600	$ (21,054)	$ (5,167)	$ (4,469)