Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 9,403	$ 6,211
Short-term investments, net	947	2,957
Accounts receivable, net of allowance for doubtful accounts of $0 and $14 as of December 31, 2012 and 2011, respectively	31	40
Inventories	915	892
Prepaid expenses and other current assets	103	100
Total current assets	11,399	10,200
Property and equipment, net	457	467
Total assets	11,856	10,667
Current liabilities:
Accounts payable	333	85
Accrued liabilities	455	175
Total current liabilities	788	260
Commitments and contingencies (Note 7)
Stockholders' equity:
Undesignated stock, $0.01 par value, 10,000,000 shares authorized, no shares issued and outstanding as of December 31, 2012 and 2011, respectively
Common stock, $0.01 par value, 40,000,000 shares authorized, 26,346,079 and 16,245,579 issued and outstanding as of December 31, 2012 and 2011, respectively	263	162
Additional paid-in capital	40,655	34,591
Accumulated other comprehensive loss		(3)
Accumulated deficit	(29,850)	(24,343)
Total stockholders' equity	11,068	10,407
Total liabilities and stockholders' equity	$ 11,856	$ 10,667