Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities
Net loss	$ (12,019,278)	$ (15,052,263)
Adjustments to reconcile net loss to net cash used in operating activities
Shares issued for services	78,213	306,103
Depreciation	351,403	387,779
Option expense	835,723	959,898
Loss on disposal of fixed assets	1,167	0
Changes in:
Other current assets	(87,780)	513,304
Accounts payable	37,356	6,339
Accrued expenses	(191,107)	(183,477)
Deferred revenue	443,671	138,727
Other long-term assets	38,939	(1,271,895)
Net cash used in operating activities	(10,511,693)	(14,195,485)
Cash flows from investing activities
Purchase of property & equipment	(92,333)	(190,859)
Net cash provided by (used in) investing activities	(92,333)	(190,859)
Cash flows from financing activities
Common stock and warrants sold for cash, net of offering costs	13,282,035	648,175
Cash generated from exercise of warrants	4,410	0
Repurchase of fractional shares	(5,028)	0
Net cash provided by financing activities	13,281,417	648,175
Net change in cash and cash equivalents	2,677,391	(13,738,169)
Cash and cash equivalents at beginning of period	9,906,373	23,644,542
Cash and cash equivalents at end of period	12,583,764	9,906,373
Cash paid for:
Income tax	0	0
Interest	$ 2,315	$ 1,983