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Condensed Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Cash flows from operating activities:    
Net income (loss) $ 412 $ (2,069)
Adjustments to reconcile net loss to net cash used in operating activities:    
Gain on sale of asset, net of transaction expenses   (514)
Depreciation 308 347
Stock-based compensation expense 110 42
Amortization of deferred financing costs and debt discount 536 709
Change in fair value of derivative liability (2,783)   
Changes in deferred rent (15) (8)
Changes in operating assets and liabilities:    
Accounts receivable and unbilled services (275) (233)
Prepaid expenses, other assets, and deferred costs 186 (106)
Accounts payable and accrued expenses 635 (239)
Interest payable - related party   226
Deferred revenue 1,047 (6)
Net cash provided by (used in) operating activities 161 (1,851)
Cash flows from investing activities:    
Proceeds from sale of asset, net of transaction expenses   514
Purchases of property and equipment (74) (266)
Net cash (used in) provided by investing activities (74) 248
Cash flows from financing activities:    
Proceeds from sale of preferred stock 544  
Payments of deferred offering costs (1,388)  
Proceeds from exercise of stock options 5  
Net cash used in financing activities (839)  
Decrease in cash and cash equivalents (752) (1,603)
Cash and cash equivalents, beginning of period 1,402 2,385
Cash and cash equivalents, end of period 650 782
Supplemental cash flow information:    
Cash paid for interest 45 50
Noncash financing and investing activities:    
Beneficial conversion feature on sale of Series D-2 preferred stock 909   
Beneficial conversion feature for antidilution adjustment 214   
Adjustment of preferred stock to redemption value 510   
Deemed contribution of a loan guarantee   3,930
Issuance of warrants with preferred stock 544  
Deferred offering costs included in accounts payable and accrued expenses 1,715  
Equipment purchase in accounts payable and accrued expenses $ 204 $ 45