Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Dec. 31, 2017	14,688
Balance at Dec. 31, 2017	$ 147,000	$ 68,617,000	$ 199,511,000	$ (4,784,000)	$ 263,491,000
Issuance of common stock for equity awards (in shares)	89
Issuance of common stock for equity awards	$ 1,000	511,000			512,000
Retirement of common stock for minimum tax withholdings (in shares)	(32)
Retirement of common stock for minimum tax withholdings	$ (1,000)	(1,735,000)			(1,736,000)
Stock-based compensation expense		7,565,000			7,565,000
Net income (loss)			(6,686,000)		(6,686,000)
Other comprehensive Income (loss)				620,000	620,000
Balance (in shares) at Mar. 31, 2018	14,745
Balance at Mar. 31, 2018	$ 147,000	74,958,000	192,825,000	(4,164,000)	263,766,000
Balance (in shares) at Dec. 31, 2018	14,210
Balance at Dec. 31, 2018	$ 142,000	50,763,000	218,233,000	(5,526,000)	263,612,000
Issuance of common stock for equity awards (in shares)	7
Issuance of common stock for equity awards		5,000			5,000
Retirement of common stock for minimum tax withholdings (in shares)	(3)
Retirement of common stock for minimum tax withholdings		(124,000)			(124,000)
Stock-based compensation expense		1,386,000			1,386,000
Net income (loss)			4,507,000		4,507,000
Other comprehensive Income (loss)				(315,000)	(315,000)
Balance (in shares) at Mar. 31, 2019	14,214
Balance at Mar. 31, 2019	$ 142,000	$ 52,030,000	$ 222,740,000	$ (5,841,000)	$ 269,071,000