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Condensed Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 650 $ 1,402
Accounts receivable, net of allowance for bad debts 900 719
Unbilled services 437 343
Prepaid expenses and other current assets 305 489
Total current assets 2,292 2,953
Property and equipment, net of accumulated depreciation 5,321 5,401
Deferred financing costs 1,608 2,144
Other assets 112 114
Deferred offering costs 3,645 1,775
Total assets 12,978 12,387
Liabilities, convertible preferred stock, and stockholders' deficit    
Accounts payable 2,660 1,932
Accrued expenses 1,602 1,058
Deferred revenue, current portion 1,251 487
Current portion of long-term debt 15,000 15,000
Total current liabilities 20,513 18,477
Deferred revenue, net of current portion 1,426 1,144
Derivative liability 9,998 12,237
Deferred rent 1,466 1,481
Total liabilities 33,403 33,339
Commitments and contingencies (Note 5)      
Stockholders' deficit:    
Common stock, $0.001 par value, authorized 70,000,000 shares; 334,484 and 334,068 shares issued and outstanding as of March 31, 2014 and December 31, 2013      
Additional paid-in capital 3,650 5,168
Accumulated deficit (112,865) (113,277)
Total stockholders' deficit (109,215) (108,109)
Total liabilities, convertible preferred stock, and stockholders' deficit 12,978 12,387
Series A Convertible Preferred Stock [Member]
    
Liabilities, convertible preferred stock, and stockholders' deficit    
Convertible preferred stock 250 250
Series B Convertible Preferred Stock [Member]
    
Liabilities, convertible preferred stock, and stockholders' deficit    
Convertible preferred stock 4,215 4,215
Series C Convertible Preferred Stock [Member]
    
Liabilities, convertible preferred stock, and stockholders' deficit    
Convertible preferred stock 28,121 28,121
Series C-2 Convertible Preferred Stock [Member]
    
Liabilities, convertible preferred stock, and stockholders' deficit    
Convertible preferred stock 13,500 13,500
Series D-1 Convertible Preferred Stock [Member]
    
Liabilities, convertible preferred stock, and stockholders' deficit    
Convertible preferred stock 16,952 16,952
Series D-2 Convertible Preferred Stock [Member]
    
Liabilities, convertible preferred stock, and stockholders' deficit    
Convertible preferred stock $ 25,752 $ 24,119