Related Party Transactions - Additional Information (Detail) (USD $)	9 Months Ended	12 Months Ended	0 Months Ended	3 Months Ended	9 Months Ended		9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Aug. 08, 2012 Peregrine [Member]	Sep. 30, 2014 Peregrine [Member]	Sep. 30, 2014 Peregrine [Member]	Dec. 31, 2013 Peregrine [Member]	Sep. 30, 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			7.341
Conversion of preferred stock to common stock shares									183,302
Unrealized gain (loss) on investments	133,000	(406,000)		1,000,000	909,000.0
Revenue from related party				455,000	600,000
Accounts receivable from related party				$ 455,000,000	$ 455,000,000	$ 0
Description of conversion of preferred shares to common					Conversion of the preferred shares to common stock at a ratio of 7.341, or 183,302 shares of common stock