Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:
Net loss	$ (10,033)	$ (7,159)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation expense	2,101	2,957
Depreciation and amortization	104	68
Loss on disposal of property and equipment	1
Changes in operating assets and liabilities:
Accounts receivable	1,040	1,841
Prepaid expenses and other current assets	(458)	(135)
Accounts payable and accrued expenses	(32)	138
Deferred revenue	748	688
Net cash used in operating activities	(6,529)	(1,602)
Cash flows from investing activities:
Purchase of property and equipment	(136)	(290)
Net cash used in investing activities	(136)	(290)
Cash flows from financing activities:
Proceeds from issuance of common stock, net of offering costs	6,899
Proceeds from exercise of stock options	524
Proceeds from exercise of warrants	699	155
Net cash provided by financing activities	8,122	155
Effect of exchange rate changes on cash	14	43
Net increase (decrease) in cash	1,471	(1,694)
Cash at beginning of period	9,097	12,940
Cash at end of period	10,568	11,246
Cash paid during the period for:
Interest paid
Income taxes paid	95	71
Supplemental disclosure of non-cash investing and financing activities:
Cashless exercise of warrants	3
Non Cash Stock subscription receivable	$ 286