Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 10,493	$ 11,763
Short-term investments	2,201	3,078
Accounts receivable, net of allowances for doubtful accounts and other adjustments of $603 (2014) and $617 (2013)	7,355	7,563
Income tax receivable	699	699
Inventories, net of reserves for excess and obsolete inventory of $237 (2014) and $301 (2013)	165	167
Prepaid expenses and other current assets	1,128	871
Deferred tax asset	152	152
Total current assets	22,193	24,293
Equipment and improvements, net	4,697	7,023
Other assets	205	222
Total assets	27,095	31,538
Current liabilities:
Accounts payable	2,145	1,632
Accrued liabilities	6,079	7,734
Deferred revenue	731	464
Total current liabilities	8,955	9,830
Non-current liabilities:
Deferred rent and other long-term liabilities	3,736	3,383
Deferred tax liability	152	154
Total non-current liabilities	3,888	3,537
Commitments and contingencies
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; 45,058,093 and 36,994,318 shares issued and outstanding at September 30, 2014 and December 31, 2013, respectively	45	37
Additional paid-in capital	222,696	214,619
Accumulated comprehensive deficit	(208,489)	(196,485)
Total stockholders' equity	14,252	18,171
Total liabilities and stockholders' equity	$ 27,095	$ 31,538