Selected Quarterly Results (Unaudited) - Selected Quarterly Results (Detail) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Selected Quarterly Financial Information [Abstract]
Revenue	$ 3,973,000	$ 2,997,000	$ 2,764,000	$ 1,622,000	$ 19,851,000	$ 1,875,000	$ 16,298,000	$ 16,518,000	$ 11,355,883	$ 54,542,426	$ 3,262,920
Gross profit	3,599,000	2,354,000	2,074,000	1,247,000	19,066,000	1,500,000	15,923,000	16,143,000
Income (loss) from operations	(11,799,000)	(17,083,000)	(13,808,000)	(13,712,000)	5,408,000	(14,059,000)	7,148,000	8,565,000	(56,401,941)	7,061,790	(26,987,976)
Net income (loss)	$ (12,770,000)	$ (18,486,000)	$ (13,415,000)	$ (12,723,000)	$ 8,596,000	$ (17,477,000)	$ 3,783,000	$ 6,751,000	$ (57,393,613)	$ 1,652,181	$ (23,325,116)
Basic income (loss) per share	$ (0.33)	$ (0.49)	$ (0.35)	$ (0.34)	$ 0.26	$ (0.58)	$ 0.13	$ 0.23	$ (1.51)	$ 0.05	$ (0.82)
Diluted income (loss) per share	$ (0.33)	$ (0.49)	$ (0.35)	$ (0.34)	$ 0.19	$ (0.58)	$ 0.12	$ 0.23	$ (1.51)	$ 0.05	$ (0.82)