Stockholders' Equity - Additional Information (Detail) (USD $)	9 Months Ended						3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Jul. 17, 2013	Feb. 28, 2014 Initial Tranche [Member]	May 12, 2014 Second Tranche [Member]	Mar. 31, 2013 At-the-market Transaction [Member]	Sep. 30, 2014 Shanxi Taxus [Member]
Stockholders Equity [Line Items]
Common stock shares sold	12,308,988		8,810,624		714,286	2,330,278	17,187
Net proceeds from equity financing	$ 1,829,999	$ 3,692,853					$ 65,743
Common stock shares sold value	1,231		881		500,000	1,500,000
Common stock per share	$ 0.0001		$ 0.0001	$ 0.0001	$ 0.70	$ 0.6437
Warrants issued								0
Sale of securities to strategic investor	$ 300,000							$ 300,000
Percentage of price agreed to purchase securities	10.00%							10.00%