Consolidated statements of changes in convertible preferred stock and stockholders' equity (USD $)	Total	Convertible preferred stock $0.01 par value-4,000,000 shares authorized as of December 31, 2010 and 2011 and 10,000,000 shares authorized as of December 31, 2012 and 2013 Series A	Common stock $0.01 par value-70,000,000 shares authorized as of December 31, 2010 and 80,000,000 shares authorized as of December 31, 2011 and 250,000,000 shares authorized as of December 31, 2012 and 2013	Additional paid-In capital	Accumulated other comprehensive (loss) income	Accumulated deficit
Balance at Dec. 31, 2010	$ 5,676,710	$ 22,438	$ 460,684	$ 85,066,856	$ (27,600)	$ (79,845,668)
Balance (in shares) at Dec. 31, 2010		2,243,750	46,068,496
Increase (Decrease) in Stockholders' Equity
Stock issued	9,855,881		44,848	9,811,033
Stock issued (in shares)			4,484,776
Restricted stock issued	9,150		9,150
Restricted stock issued (in shares)			915,000
Warrants exercised			286	(286)
Warrants exercised (in shares)			28,560
Options exercised	260,815		2,676	258,139
Options exercised (in shares)			267,573
Warrant expense	14,928			14,928
Stock-based compensation expense	555,882			555,882
Cumulative translation adjustment	(13,129)				(13,129)
Net income (loss)	2,384,729					2,384,729
Balance at Dec. 31, 2011	18,744,966	22,438	517,644	95,706,552	(40,729)	(77,460,939)
Balance (in shares) at Dec. 31, 2011		2,243,750	51,764,405
Increase (Decrease) in Stockholders' Equity
Stock issued	1,601,746		4,884	1,596,862
Stock issued (in shares)			488,337
Warrants exercised			9,176	(9,176)
Warrants exercised (in shares)			917,602
Options exercised	774,749		4,885	769,864
Options exercised (in shares)			488,513
Stock-based compensation expense	1,135,047			1,135,047
Cumulative translation adjustment	78,654				78,654
Net income (loss)	(4,452,305)					(4,452,305)
Balance at Dec. 31, 2012	17,882,857	22,438	536,589	99,199,149	37,925	(81,913,244)
Balance (in shares) at Dec. 31, 2012		2,243,750	53,658,857
Increase (Decrease) in Stockholders' Equity
Restricted stock issued	(15,311)		8,607	(23,918)
Restricted stock issued (in shares)			860,739
Warrants exercised			2,131	(2,131)
Warrants exercised (in shares)			213,123
Options exercised	589,131		3,048	586,083
Options exercised (in shares)			304,769
Stock-based compensation expense	1,279,502			1,279,502
Cumulative translation adjustment	97,306				97,306
Net income (loss)	22,006					22,006
Balance at Dec. 31, 2013	$ 19,855,491	$ 22,438	$ 550,375	$ 101,038,685	$ 135,231	$ (81,891,238)
Balance (in shares) at Dec. 31, 2013		2,243,750	55,037,488