Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 11,763	$ 18,873
Short-term investments	3,078	13,328
Accounts receivable, net of allowances for doubtful accounts and other adjustments of $617 (2013) and $482 (2012)	7,563	8,953
Income tax receivable	699	681
Inventories, net of reserves for excess and obsolete inventory of $301 (2013) and $352 (2012)	167	176
Prepaid expenses and other current assets	871	903
Deferred tax asset	152	89
Total current assets	24,293	43,003
Equipment and improvements, net	7,023	11,211
Other assets	222	181
Total assets	31,538	54,395
Current liabilities:
Accounts payable	1,632	1,978
Accrued liabilities	7,734	4,829
Deferred revenue	464	1,436
Total current liabilities	9,830	8,243
Non-current liabilities:
Deferred rent and other long term liabilities	3,383	3,399
Deferred tax liability	154	91
Total non-current liabilities	3,537	3,490
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; 36,994,318 and 35,873,418 shares issued and outstanding at December 31, 2013 and December 31, 2012, respectively	37	36
Additional paid-in capital	214,619	211,165
Accumulated comprehensive deficit	(196,485)	(168,539)
Total stockholders' equity	18,171	42,662
Total liabilities and stockholders' equity	$ 31,538	$ 54,395