Stockholders' Equity (Narrative) (Details) (USD $)	3 Months Ended		3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Retiring Director [Member]	Mar. 31, 2013 Board of Directors [Member]	Mar. 31, 2013 Stock options [Member]	Mar. 31, 2012 Stock options [Member]	Mar. 31, 2013 Restricted share units [Member]	Mar. 31, 2012 Restricted share units [Member]	Mar. 31, 2013 Restricted share units [Member] Retiring Director [Member]	Mar. 31, 2013 Restricted share units [Member] Board of Directors [Member]	Mar. 31, 2013 Service based options [Member]	Mar. 31, 2013 Service based options [Member] Employees [Member]	Mar. 31, 2013 Service based options [Member] Board of Directors [Member]	Mar. 31, 2013 Performance based options [Member]	Mar. 31, 2013 Performance based options [Member] Employees [Member]	Mar. 31, 2013 Performance based options [Member] Board of Directors [Member]	Mar. 31, 2013 Conversion Ratio Adjustments [Member]
Class of Stock [Line Items]
Convertible preferred stock, shares outstanding	73,332	73,332															73,332
Number of common stock shares issuable for preferred stock																	121,089
Additional shares issuable																	141,448
Issuance costs	$ 22,577
Common stock, shares authorized	25,000,000	25,000,000
Shares of common stock issued upon the exercise of stock purchase warrants and options	216,462
Amount received upon the exercise of stock purchase warrants and options	1,608,106
Cost of stock purchase warrants and options exercised	3,666
Shares of common stock issued in connection with the vesting of restricted common stock	19,712
Shares of restricted common stock vested	27,900
Intrinsic value of options exercised	294,696
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants to purchase shares of common stock	2,743,050
Number of shares of common stock authorized to be issued pursuant to the plan	2,812,500			4,500,000
Number of shares reserved for issuance under the plan	5,565,952
Shares issued			4,450		1,794,401		764,000
Shares outstanding	1,794,401	1,639,985			1,794,401		764,000
Shares available for grant	1,964
Contractual option life	10 years								36 months
Granted	193,980								5,000	29,600		173,980	82,000		20,000	95,600
Weighted average fair value per share of options granted												$ 7.59			$ 7.59
Unrecognized compensation cost							5,785,281				1,593,932			7,550
Remaining weighted average vesting period							3 years 4 days				1 year 9 months 22 days			3 months
Shares withheld in satisfaction of employee tax withholding obligations							8,188
Fair value of shares withheld in satisfaction of employee tax withholding obligations							76,446
Stock option compensation expense			$ 337,422		$ 621,073	$ 405,596	$ 531,596	$ 89,322