Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014
Cash flows from operating activities:
Net loss		$ (17,812,415)	$ (19,735,480)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization		545,698	671,562
Stock-based compensation		2,660,468	1,034,766
Amortization of debt discount and issuance costs		75,199	136,873
Gain on disposal of fixed assets		(148,898)	5,671
Change in fair value of warrant liability		(641,037)	3,981,094
Changes in operating assets and liabilities:
Trade receivables		153,026	23,693
Other receivables		69,251	366,487
Prepaid and other current assets		182,581	(170,663)
Accounts payable and accrued expenses		(1,536,194)	(583,429)
Deferred revenue		(8,413)	(31,763)
Deferred rent		(23,766)	6,797
Other assets non-current			17,207
Net cash used in operating activities		(16,484,500)	(14,277,185)
Cash flows from investing activities:
Purchases of property, plant and equipment		(556,313)	(362,873)
Proceeds from sale of property, plant and equipment		148,713
Net cash used in investing activities		(407,600)	(362,873)
Cash flows from financing activities:
Proceeds from issuance of common stock, net of issuance costs		24,942,963	279,084
Proceeds from exercise of warrants, net of issuance costs			316,350
Proceeds from loan payable, net of issuance costs			3,820,264
Repayment of loan payable		(2,698,054)	(2,007,457)
Repayment of capital lease obligations		(11,014)	(10,466)
Payments related to net share issuance of stock based awards		(386,488)	(499,333)
Net cash provided by financing activities		21,847,407	1,898,442
Increase (decrease) in cash and cash equivalents		4,955,307	(12,741,616)
Effects of foreign exchange rate changes on cash		(13,770)	3,289
Cash and cash equivalents, beginning of period		24,987,603	30,585,424
Cash and cash equivalents, end of period		29,929,140	17,847,097
Supplemental disclosure of cash flow information:
Interest paid		143,036	$ 272,478
Supplemental schedule of non-cash investing and financing activities:
Equipment acquired under a capital lease	[1]	$ 23,617

[1] Represents the present value of future minimum capital lease payments for equipment leased.