Related Party Transactions - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended			3 Months Ended
	Aug. 08, 2012 Peregrine [Member]	Mar. 31, 2014 Peregrine [Member]	Mar. 31, 2013 Peregrine [Member]	Dec. 31, 2013 Peregrine [Member]	Mar. 31, 2014 Series D1 Preferred Shares [Member]	Nov. 30, 2008 Series D1 Preferred Shares [Member] Peregrine [Member]	Aug. 08, 2012 Common stock [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%
Conversion of preferred stock to common stock ratio	7.34
Conversion of preferred stock to common stock shares							183,303
Unrealized gain (loss) on investments		(249,000)
Accounts receivable from related party		0		0
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
Revenue from related party			$ 5,400,000