Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 2,083	$ 1,440
Accounts receivable, less allowance of $1,184 in 2014 and $573 in 2013	6,597	11,127
Inventory, net	11,850	11,378
Prepaid expenses and other current assets	909	1,909
Total current assets	21,439	25,854
Property, plant, and equipment, net	1,625	1,826
Intangible assets, net	148	183
Goodwill	2,926	2,926
Other assets	260	249
Total assets	26,398	31,038
Current liabilities:
Lines of credit	3,304	4,633
Accounts payable	10,016	8,560
Accrued liabilities	5,907	4,997
Customer deposits	140	285
Deferred revenue, current portion	3,234	3,464
Total current liabilities	22,601	21,939
Deferred income taxes	647	617
Deferred revenue, long-term		1
Warranty accrual, long-term	247
Total liabilities	23,495	22,557
Commitments, contingencies and subsequent events (Notes 8, 9, and 13)
Stockholders' equity:
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, 39,600 and 37,336 shares issued in 2014 and 2013, respectively; 37,636 and 35,372 shares outstanding in 2014 and 2013, respectively	40	38
Additional paid-in-capital	154,620	148,866
Accumulated other comprehensive loss	(282)	(274)
Accumulated deficit	(135,076)	(123,750)
Stockholders' equity excluding treasury stock	19,302	24,880
Treasury stock (cost of 1,964 shares repurchased)	(16,399)	(16,399)
Total stockholders' equity	2,903	8,481
Total liabilities and stockholders' equity	$ 26,398	$ 31,038