Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 10,165	$ 11,763
Short-term investments	2,880	3,078
Accounts receivable, net of allowances for doubtful accounts and other adjustments of $602 (2014) and $617 (2013)	8,216	7,563
Income tax receivable	706	699
Inventories, net of reserves for excess and obsolete inventory of $151 (2014) and $301 (2013)	97	167
Prepaid expenses and other current assets	765	871
Deferred tax asset		152
Total current assets	22,829	24,293
Equipment and improvements, net	4,273	7,023
Other assets	214	222
Deferred tax asset	74
Total assets	27,390	31,538
Current liabilities:
Accounts payable	1,521	1,632
Accrued liabilities	5,752	7,734
Deferred revenue	1,498	464
Deferred tax liability	74
Total current liabilities	8,845	9,830
Non-current liabilities:
Deferred rent and other long term liabilities	3,643	3,383
Deferred tax liability		154
Total non-current liabilities	3,643	3,537
Commitments and contingencies (Note 5)
Stockholders' equity:
Preferred stock, par value $0.001 per share; 5,000,000 shares authorized; none issued or outstanding
Common stock, par value $0.001 per share; 100,000,000 shares authorized; 45,000,891 and 36,994,318 shares issued and outstanding at December 31, 2014 and December 31, 2013, respectively	45	37
Additional paid-in capital	223,141	214,619
Accumulated comprehensive deficit	(208,284)	(196,485)
Total stockholders' equity	14,902	18,171
Total liabilities and stockholders' equity	$ 27,390	$ 31,538