Build-to-Suit Lease Obligation - Additional Information (Detail) (USD $)	1 Months Ended
	Feb. 28, 2015 sqft	Mar. 31, 2015
Build To Suit Lease Obligation [Line Items]
Build-to-suit lease obligation current liability		$ 341,000
Build-to-suit lease obligation non-current liability		9,545,000
Bothell Lease [Member]
Build To Suit Lease Obligation [Line Items]
Operating lease space, in square feet	68,000
Lease commenced date	Mar. 01, 2015
Lease agreement date	2015-02
Bothell Lease [Member] | Property, Plant and Equipment [Member]
Build To Suit Lease Obligation [Line Items]
Capitalized value of build-to-suit property	9,900,000