Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 1,229	$ 2,543
Accounts receivable, less allowance of $289 and $304 in 2013 and 2012, respectively	10,644	11,680
Inventory, net	11,921	11,142
Prepaid expenses and other current assets	1,637	1,552
Total current assets	25,431	26,917
Property, plant, and equipment, net	1,616	1,509
Intangible assets, net	254	300
Goodwill	2,926	2,926
Deferred tax asset	15	16
Other assets	282	305
Total assets	30,524	31,973
Current liabilities:
Lines of credit	3,261	1,637
Accounts payable	8,708	7,663
Accrued liabilities	4,879	6,267
Customer deposits	278	582
Deferred revenue, current portion	3,131	3,226
Total current liabilities	20,257	19,375
Deferred tax liabilities	556	663
Other liabilities, long-term	34	141
Total liabilities	20,847	20,179
Commitments and contingencies (Notes 8, 9, and 13)
Stockholders' equity (deficit):
Preferred stock, par value $0.001, 1,000 shares authorized, no shares issued and outstanding
Common stock, par value $0.001, 50,000 shares authorized; 33,487 and 33,248 shares issued in 2013 and 2012, respectively; and 31,523 and 31,284 shares outstanding in 2013 and 2012, respectively	34	34
Additional paid-in capital	141,317	140,747
Accumulated other comprehensive loss	(376)	(320)
Accumulated deficit	(114,899)	(112,268)
Stockholders' equity excluding treasury stock	26,076	28,193
Treasury stock (cost of 1,964 shares repurchased)	(16,399)	(16,399)
Total stockholders' equity	9,677	11,794
Total liabilities and stockholders' equity	$ 30,524	$ 31,973