Commitments and Contingencies - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended		12 Months Ended
	Aug. 31, 2013	Mar. 31, 2015	Jun. 30, 2014	Dec. 31, 2016	Dec. 31, 2015
Other Commitments [Line Items]
Third party software vendor licensed lost			$ 934,000
Accrued contingent liability			$ 100,000
Loss contingency receivable		$ 934,000
Payment of legal expenses		$ 85,000
Operating leases, expiration year				2020
Rent expense				$ 1,000,000	$ 1,100,000
Restricted cash equivalents					$ 250,000
Volume pricing agreements period of OVRP				12 months
Bellevue [Member] | Washington [Member]
Other Commitments [Line Items]
Expiration date of operating lease	2014-08
Extended expiration date of operating lease	2020-05