Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities:
Net loss	$ (7,078)	$ (3,993)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	8	24
Amortization of deferred charges	34
Share-based compensation	491	125
Change in operating assets and liabilities:
Other current assets	132	(80)
Other assets	(452)	44
Accounts payable	(232)	382
Accrued expenses and other liabilities	(432)	98
Deferred rent	2	(16)
Net cash used in operating activities	(7,527)	(3,416)
Cash flows from investing activities:
Purchase of property and equipment	(5)	(28)
Net cash used in investing activities	(5)	(28)
Cash flows from financing activities:
Proceeds from the issuance of preferred stock		20,000
Preferred stock offering costs		(2,083)
Proceeds from the issuance of common stock	9,038	1,741
Common stock offering costs	(834)	(328)
Repayment of principal on vendor finance agreement	(179)	(174)
Net cash provided by financing activities	8,025	19,156
Net increase in cash and cash equivalents	493	15,712
Cash and cash equivalents, beginning of period	16,756	2,920
Cash and cash equivalents, end of period	17,249	18,632
Supplemental cash flow information:
Interest paid	3	3
Supplemental disclosure of noncash investing and financing transactions:
Vendor finance agreement	$ 0	$ 0