Commitments and Contingencies - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Corporate offices [Member]
Operating Leased Assets [Line Items]
Lease expiration date	Jun. 30, 2018
Operating lease agreement period	5 years
Operating lease amended extension period	3 years 2 months
Operating lease, renew option period	3 years
Warehouse [Member]
Operating Leased Assets [Line Items]
Operating lease agreement period	4 years 4 months
Operating lease additional renewed period	6 years
Operating leases, rent expense	$ 424,000	$ 360,000
Office Building [Member]
Operating Leased Assets [Line Items]
Operating leases, rent expense	89,000	55,000
Shareholder [Member] | Office Building [Member]
Operating Leased Assets [Line Items]
Operating leases, rent expense	89,000	48,000
Royalty Agreement Terms [Member]
Operating Leased Assets [Line Items]
Percentage of royalty paid for one to three years	1.50%
Percentage of royalty paid for one to three years	4.00%
Royalty payment period	10 years
Royalty expense	0	0
Manufacturing Facility [Member]
Operating Leased Assets [Line Items]
Operating leases, rent expense		55,000
Manufacturing facility leased period		1 year
Microline [Member]
Operating Leased Assets [Line Items]
Amount due in milestone fees for contract development	$ 1,000,000