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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Cash flows from operating activities:    
Net loss $ (4,794) $ (2,270)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation and amortization 5 19
Share-based compensation 330 76
Change in operating assets and liabilities:    
Other current assets 45 15
Other assets (701) 40
Accounts payable 128 322
Accrued expenses and other liabilities (464) 71
Deferred rent 1 (13)
Net cash used in operating activities (5,450) (1,740)
Cash flows from investing activities:    
Purchase of property and equipment (5) (17)
Net cash used in investing activities (5) (17)
Cash flows from financing activities:    
Proceeds from the issuance of preferred stock   20,000
Proceeds from the issuance of common stock 9,038 1,741
Repayment of principal on vendor finance agreement (128) (109)
Net cash provided by financing activities 8,076 19,211
Net increase in cash and cash equivalents 2,621 17,454
Cash and cash equivalents, beginning of period 16,756 2,920
Cash and cash equivalents, end of period 19,377 20,374
Supplemental cash flow information:    
Interest paid 2 3
Supplemental disclosure of noncash investing and financing transactions:    
Vendor finance agreement 128 65
Preferred Stock
    
Cash flows from financing activities:    
Payment of offering costs   (2,083)
Common Stock
    
Cash flows from financing activities:    
Payment of offering costs $ (834) $ (338)