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Balance Sheets (USD $)
Mar. 31, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 2,491,838 $ 10,977,974
Short-term investments (Note 1) 6,775,800 1,162,904
Prepaid expenses and other current assets 286,761 387,480
Total current assets 9,554,399 12,528,358
Property and equipment, net (Notes 2) 2,428,789 2,484,539
Other long term assets, net (Notes 1 and 3) 1,610,964 1,601,894
Total assets 13,594,152 16,614,791
Current liabilities:    
Accounts payable 704,782 613,925
Accrued compensation 31,695 452,878
Accrued expenses 452,749 642,055
Notes and other obligations, current portion (Note 4) 1,945,383 2,290,292
Deferred revenue, current portion (Note 7) 84,995 79,803
Total current liabilities 3,219,604 4,078,953
Notes and other obligations, less current portion (Note 4) 746,776 763,132
Deferred revenue, less current portion (Note 7) 1,254,719 1,081,706
Total liabilities 5,221,099 5,923,791
Commitments and contingencies (Notes 7 and 8)      
Stockholders' equity (Notes 5 and 6):    
Common stock, no par value, 30,000,000 shares authorized; 9,954,380 shares issued and outstanding 85,408,355 84,924,133
Accumulated deficit (77,035,302) (74,233,133)
Total stockholders' equity 8,373,053 10,691,000
Total liabilities and stockholders' equity $ 13,594,152 $ 16,614,791