Commitments and Contingencies - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended			1 Months Ended	7 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Aug. 31, 2013 Bellevue Washington [Member]	Dec. 31, 2013 Bellevue Washington [Member]
Other Commitments [Line Items]
Expirations of operating leases			2020
Expiration date of operating lease						2014-08
Amended expiration date of operating lease						2020-05
Cash lease payments made							$ 0
Leasehold improvements and furniture provided by the landlord						1,128,000
Rent expense	281,000	402,000	918,000	1,156,000
Restricted cash	250,000		250,000		250,000
Volume pricing agreements period of OVRP			12 months
Provision on contingencies	$ 0		$ 0