Quarterly Financial Information (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]
Net revenues	$ 9,100	$ 8,186	$ 8,215	$ 9,401	$ 13,025	$ 11,496	$ 11,308	$ 13,077	$ 34,902	$ 48,906
Contribution margin	1,334	805	864	1,108	1,590	722	779	1,427	4,111	4,518
Contribution margin %	14.70%	9.80%	10.50%	11.80%	12.20%	6.30%	6.90%	10.90%
Income (loss) before income taxes	(626)	(1,071)	(812)	(551)	150	(5,554)	(965)	(224)	(3,060)	(6,593)
Net income (loss)	$ (629)	$ (1,075)	$ (829)	$ (558)	$ 153	$ (6,523)	$ (645)	$ (222)	$ (3,091)	$ (7,237)
Earnings (loss) per diluted share	$ (0.11)	$ (0.19)	$ (0.14)	$ (0.10)	$ 0.03	$ (1.15)	$ (0.12)	$ (0.04)
Shares used in computing diluted earnings (loss) per share	5,711	5,711	5,710	5,696	5,716	5,670	5,654	5,654