Related Party Transactions - Additional Information (Detail) (USD $)	0 Months Ended	12 Months Ended				12 Months Ended
	Aug. 31, 2012 Peregrine [Member]	Dec. 31, 2013 Peregrine [Member]	Dec. 31, 2012 Peregrine [Member]	Dec. 31, 2011 Peregrine [Member]	Aug. 08, 2012 Peregrine [Member] Common stock [Member]	Dec. 31, 2013 Series D1 Preferred Shares [Member]	Nov. 30, 2008 Series D1 Preferred Shares [Member] Peregrine [Member]
Related Party Transaction [Line Items]
Purchase of preferred shares							1,345,444
Value of preferred shares							$ 2,000,000
Outstanding shares, description						Less than 1%
Outstanding shares, percentage		1.00%
Description of conversion of preferred shares to common	Conversion of the preferred shares to common stock at a ratio of 7.34:1, or 183,303 shares of common stock
Conversion of preferred stock to common stock ratio	7.34
Conversion of preferred stock to common stock shares					183,303
Lock out period until which Company could not sell shares		2013-02
Unrealized gain (loss) on investments		(1,400,000)	806,000
Revenue from related party		11,000,000	25,200,000	5,200,000
Accounts receivable from related party		$ 0	$ 1,700,000