Consolidated Statements of Cash Flows (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net loss	$ (12,880,598)	$ (20,324,264)	$ (33,962,548)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	885,657	1,009,876	2,132,136
Share-based compensation expense	209,961	1,694,842	4,830,831
Gain on sale of eSign	(1,304,579)	0	0
Impairment of goodwill and purchased intangible assets	0	4,205,000	7,477,832
Accretion of royalty liability	97,300	81,400	67,500
Changes in assets and liabilities, net of effects from business acquisition:
Decrease in accounts receivable	1,161,610	2,315,840	1,900,250
Decrease (increase) in prepaid expenses and other current assets	90,967	(66,887)	401,992
(Increase) decrease in other assets	(2,184)	157,468	11,993
(Decrease) increase in accounts payable and accrued expenses	(2,960,783)	(735,449)	924,087
(Decrease) increase in deferred revenue	(1,832,745)	238,454	106,922
Increase (decrease) in royalty liability	386,377	(103,900)	321,076
(Decrease) increase in other long-term liabilities	(27,839)	(19,378)	31,713
Net cash used in operating activities	(16,176,856)	(11,546,998)	(15,756,216)
Cash flows from investing activities:
Acquisition of property and equipment	(117,899)	(186,715)	(169,660)
Internal-use software development costs	0	(226,000)	0
Proceeds from sale of eSign	1,214,082	0	0
Net cash provided by (used in) investing activities	1,096,183	(412,715)	(169,660)
Cash flows from financing activities:
Payments on capital lease obligation	0	(44,658)	(72,075)
Net proceeds from issuance of common stock	14,457,789	11,706,066	13,659,587
Proceeds from employee stock purchase plans	158,334	263,599	666,095
Proceeds from employee stock option exercises	0	42,039	79,503
Proceeds from exercise of warrants	121,862	0	320,500
Net cash provided by financing activities	14,737,985	11,967,046	14,653,610
Net (decrease) increase in cash and cash equivalents	(342,688)	7,333	(1,272,266)
Cash and cash equivalents at beginning of year	2,120,102	2,112,769	3,385,035
Cash and cash equivalents at end of year	1,777,414	2,120,102	2,112,769
Non-cash financing activities:
Issuance of common stock for developed technology	0	500,000	0
Cashless exercise of warrants	0	0	404
Cash paid during the year for:
Interest	116,209	108,462	119,763
Income taxes	$ 7,895	$ 8,816	$ 78,235