Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 8,819	$ 10,165
Short-term investments	4,078	2,880
Accounts receivable, net of allowances for doubtful accounts and other adjustments of $201 (2015) and $602 (2014)	8,145	8,216
Income tax receivable	13	706
Inventories, net of reserves for excess and obsolete inventory of $158 (2015) and $151 (2014)	39	97
Prepaid expenses and other current assets	692	765
Total current assets	21,786	22,829
Equipment and improvements, net	2,492	4,273
Other assets	195	214
Deferred tax asset		74
Total assets	24,473	27,390
Current liabilities:
Accounts payable	1,708	1,521
Accrued liabilities	5,064	5,752
Deferred revenue	440	1,498
Deferred tax liability		74
Total current liabilities	7,212	8,845
Non-current liabilities:
Deferred rent and other long term liabilities	3,235	3,643
Total non-current liabilities	$ 3,235	$ 3,643
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; 45,729,272 and 45,000,891 shares issued and outstanding at December 31, 2015 and December 31, 2014, respectively	$ 46	$ 45
Additional paid-in capital	224,867	223,141
Accumulated comprehensive deficit	(210,887)	(208,284)
Total stockholders' equity	14,026	14,902
Total liabilities and stockholders' equity	$ 24,473	$ 27,390