Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Consolidated Statements of Cash Flows
Net loss	$ (19,979)	$ (18,844)
Adjustments to reconcile net loss to cash flows used in operating activities:
Depreciation	241	198
Stock-based compensation expense, net	1,811	1,924
Amortization of debt discount	102
Changes in operating assets and liabilities
Accounts receivable	59
Other current assets	(406)	(207)
Other assets	(108)
Accounts payable and accrued expenses	48	(429)
Net cash used in operations	(18,232)	(17,358)
Investing Activities:
Purchase of property and equipment	(175)	(205)
Net cash used in investing activities	(175)	(205)
Financing Activities:
Net proceeds from the sale of common stock	7,055	16
Proceeds from borrowings on long-term debt	8,000
Net cash provided by financing activities	15,055	16
Effect of exchange rate changes on cash	(42)	(14)
Net decrease in cash and cash equivalents	(3,394)	(17,561)
Cash and cash equivalents-beginning of period	31,293	54,136
Cash and cash equivalents-end of period	27,899	36,575
Supplement schedule of non-cash activities
Stock options and restricted stock units classified as liabilities, net		$ (337)
Warrants issued in connection with debt financing	$ 355