CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings (Accumulated Deficit) [Member]	Accumulated Other Comprehensive Income (loss) [Member]	Total
Balance at Dec. 31, 2009	$ 13	$ 85,248	$ 17,254	$ (1,662)	$ 100,853
Balance (in shares) at Dec. 31, 2009	13,436,163
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock for employee purchase plan	0	306	0	0	306
Issuance of common stock for employee purchase plan (in shares)	43,859
Exercise of stock options	1	337	0	0	338
Exercise of stock options (in shares)	90,362
Issuance of common stock in settlement of restricted stock units, net of shares withheld for employee taxes, and stock awards	0	(126)	0	0	(126)
Issuance of common stock in settlement of restricted stock units, net of shares withheld for employee taxes, and stock awards (in shares)	59,329
Stock-based compensation expense	0	4,650	0	0	4,650
Tax benefit from exercises of stock-based payment awards	0	8	0	0	8
Components of other comprehensive loss:
Net loss	0	0	(10,518)	0	(10,518)
Other comprehensive income, net of full valuation allowance on tax effect	0	0	0	(94)	(94)
Balance at Dec. 31, 2010	14	90,423	6,736	(1,756)	95,417
Balance (in shares) at Dec. 31, 2010	13,629,713
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock for employee purchase plan	0	276	0	0	276
Issuance of common stock for employee purchase plan (in shares)	45,161
Exercise of stock options	0	1,230	0	0	1,230
Exercise of stock options (in shares)	207,624
Issuance of common stock in settlement of restricted stock units, net of shares withheld for employee taxes, and stock awards	0	(146)	0	0	(146)
Issuance of common stock in settlement of restricted stock units, net of shares withheld for employee taxes, and stock awards (in shares)	65,897				37,925
Stock-based compensation expense	0	3,907	0	0	3,907
Tax benefit from exercises of stock-based payment awards	0	29	0	0	29
Components of other comprehensive loss:
Net loss	0	0	(10,061)	0	(10,061)
Other comprehensive income, net of full valuation allowance on tax effect	0	0	0	915	915
Balance at Dec. 31, 2011	14	95,719	(3,325)	(841)	91,567
Balance (in shares) at Dec. 31, 2011	13,948,395				13,948,395
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock for employee purchase plan	0	289	0	0	289
Issuance of common stock for employee purchase plan (in shares)	46,982
Exercise of stock options	0	1,480	0	0	1,480
Exercise of stock options (in shares)	211,551
Issuance of common stock in settlement of restricted stock units, net of shares withheld for employee taxes, and stock awards	0	(101)	0	0	(101)
Issuance of common stock in settlement of restricted stock units, net of shares withheld for employee taxes, and stock awards (in shares)	26,548				52,938
Stock-based compensation expense	0	3,159	0	0	3,159
Tax benefit from exercises of stock-based payment awards	0	6	0	0	6
Components of other comprehensive loss:
Net loss	0	0	(6,548)	0	(6,548)
Other comprehensive income, net of full valuation allowance on tax effect	0	0	0	922	922
Balance at Dec. 31, 2012	$ 14	$ 100,552	$ (9,873)	$ 81	$ 90,774
Balance (in shares) at Dec. 31, 2012	14,233,476				14,233,476