Quarterly report pursuant to Section 13 or 15(d)

Organization and Summary of Significant Accounting Policies - Additional Information (Details)

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Organization and Summary of Significant Accounting Policies - Additional Information (Details) (USD $)
 1 Months Ended 3 Months Ended 0 Months Ended
Feb. 11, 2014
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Mar. 31, 2014
Line of Credit
Feb. 12, 2014
IPO
Feb. 12, 2014
IPO
Underwriter Option
Class Of Stock [Line Items]              
Stock issued during period, shares, reverse stock splits 0.0387            
Common stock shares, issued           3,682,900 182,900
Common stock share issue price under IPO, per share price           $ 5.75  
Proceeds from issuance of common stock   $ 15,369,000       $ 15,400,000  
Underwriting discounts and offering costs           5,800,000  
Net loss   (4,713,000) (3,534,000)        
Cash used in operations   (2,001,000) (1,115,000)        
Accumulated deficit   (144,636,000)   (139,923,000)      
Contractual obligations   16,200,000          
Debt instrument, periodic principal payment   600,000          
Debt instrument, payment terms   As discussed further in Note 7, the Company is contractually obligated to repay $16.2 million under the GE Secured Lending Facility by making monthly principal payments of $600,000 over the next 27 months.          
Cash   13,300,000          
Proceeds from issuance of common stock, net of issuance costs   15,369,000       15,400,000  
Principal obligations due under GE Secured Lending Facility due during next twelve months, excluding interest payments and other fee         $ 5,400,000